Bad Alternator Ground Symptoms

Don't rule out a bad ground on the engine as well as from the engine to frame and engine to body. **** when you have these symptoms, the alternator is not bad ****. This leaves only 2 volts available (in a standard automotive 12V system) to power the circuit and means that all that extra power must be dissipated as heat at the resistor (bad ground). Do the following symptoms indicate a dying alternator? Bad ground? Bad wiring? Other? 2004 Forester XT Original alternator Relevant wiring modifications: aftermarket horns, 3 roof aux lamps, 2 behind the grill aux lamps, 2 reverse aux lamps, Android head unit, and fog light mod. Shop #1 wouldn't have installed another Alternator, and I would have gone to an Auto Electric Shop (Shop #2), just to have them tell me that Shop #1 had put in a bad Alternator, then there would be the dispute between Shop #1 and Shop #2 as to who was "right", and I probably would never have gotten back the $$$ I had paid to Shop #2 to tell me. The purpose of this thread is to document the symptoms and experiences with ground problems. I thought this was just maybe a bad ground somewhere so I didn't think much of that either (check gauges light was still on at this time). a bad alternator, battery, poor ground connection, a blown fuse, bad relay; even due to a parasitic draw. Don't make the same mistake I did. The current that flows through the field coil is regulated by the power module, which is controlled by a signal from the logic module. if your stock alternator is, say, 80A you should run a 100A fuse at the most. 2) For the turn signal issue, when the ground is lifted so the light goes off, why would that ground the alternator warning light wire causing the light to come on and only when the headlights are on? 3) When the alternator light comes on, is it shutting off the alternator? Would the excessive on and off burn out the alternator?. Here are the common symptoms: • Undercharging - This is the most common problem, and can often be caught in the early stages. At times, it would die when I turn the key, no noise at all. Bad alternator? Intermittent power loss at start up,not starting. When the ignition switch is in the ON position, battery current energizes the alternator. So I replaced it with a brand new one and had them run another test with the same results. It can also trick. Make sure you have good ground connections at the alternator (alternator case) and voltage regulator, especially if your vehicle uses a remote voltage. To avoid ground problems I'll advice to make a "star" ground circuit where the battery is the center of the "star". 2 How Do I Tell If the Starter Solenoid Is Bad on My Kohler Riding Mower Engine? "What Are the Symptoms of a Bad Starter Motor on a Riding Mower Engine?" com/symptoms-bad-starter-motor. Warning Signs of a Bad Alternator. Next we will discuss 3 symptoms of a bad oil control valve so that we can easily detect malfunctions in our vehicles by knowing this information. – galingong Feb 15 '17 at 9:25. A voltage drop of. Thank’s for landing here. Im pretty sure the alternator light and brake lights will come on with a dead alternator. Later on in the day it wouldn't start so I had to jump start it. 700 Loan With No Teletrack Direct Lender. Learn why your Riding Mower and Tractor Runs rough or misfires at Sears PartsDirect. Warning light. My alternator voltage used to fluctuate/pulse when the car was running. When this first happens your car will be able to continue running on battery power, but eventually the battery will be drained and the car will no lon. If they are it is probably a bad wire somewhere. Early symptoms of a failing ignition coil include engine misfires, a jumpy ride and decreased power especially at higher speeds. No change in voltage means either the regulator or alternator isn't working, while higher voltage means the regulator isn't properly "regulating. There are 2 brushes in the alternator, each one has a field terminal, one is labeled "FLD", the other is labeled "GND". Odd sounds. What’s happening and why. Weird smells. i found this by checking the field wire for a short to ground, which it did have. Corrosion develops as a result of the acidic vapor produced by the battery when it becomes hot from exposure to the heat of engine operation. It is usually way more noticeable on the A. Now alternator doesn't charge at all. Top 10 Signs of Alternator Problems. A short to negative ground of the excitation wire from panel to alternator might give these symptoms. And bad grounds can lead to all sorts of problems. My battery and alternator are new and my truck will not keep batter charge. Other parts like power seats and windows might also experience slower operation because of alternator issues. Is it the alternator or a bad ground? (2003 Volkswagen Jetta) My 2003 Jetta has these intermittent electrical gremlins where the interior lights (dash,doors,radio,etc. If it is, then check the amplifier ground and upgrade it. Traditional low-voltage (12 volt) electrical systems use a negative ground system, the "ground" almost always being the vehicle's entire chassis. However after it warms for a while the voltage drops and no current is going to the battery. I had saved your column on the Ford tractor coil problem and it really helped. I thought that noise would be a side effect of leaky diode (ac ripple). #1 – Flickering Lights If your ground strap is damaged or worn out, the electrical circuit will come across resistance while trying to deliver power to the headlights in front of your vehicle. Since your alternator is new maybe not the case then it has to be the wiring. Installed the other new alternator today. So far, I've been approaching this car as I do a Hornet, and it's paid off, but this ground issue is a new realm of electrical trickery for me. The alternator was obviously no longer charging but the car has not thrown the "charging malfunction" message yet. How to tell if your alternator is going bad. Grand Cherokee Limited 3. When car is off it's at 12. 5 Common Symptoms of a… The Body Control Module (BCM) could be considered a central organizational module for your vehicle. Symptoms of a Bad Alternator, alternator problems Symptoms of a bad alternator include hard or slow cranking when you try to start your vehicle, lights that seem too dim, and of course the red BATT, ALT, or GEN light glowing on the dash. A =LOT= of wierd engine behavior is caused by poor grounds, especially on early XJ's!. System working properly:. If car stalls, alternator is bad (this is because when the ground cable is disconnected, the car now relies on the alternator for sparks, if alt is bad, then engine stalls immediately). Symptoms of a Bad Knock Sensor The knock sensor is a technically advanced sound sensor in the engine that adjusts the timing of the ignition, enabling a smooth ride. The highest current ground is to the engine block, since that is where alternator and starter currents flow. Electrex a. A bad thermostat can. 3 the ground strap if you are under the hood is right in front of where the passanger sets and goes behind the alternator. You will kill the water pump prematurely using anything else. I am under the impression that the boat runs off the alternator and the battery just starts the boat. However, other symptoms were pointing to a bad alternator (dashboard lighting would turn off at night, headlights super dim, battery never held a charge and I kept having to jump the car). Other parts like power seats and windows might also experience slower operation because of alternator issues. The ground strap will with time become loose and cause some resistance to the headlights. A "bad ground" is not apt to affect engine performance, because if that ground is bad the engine is not likely to start. Rather than buying a ground loop isolator I bought a BT adapter that had it’s own power connection and built in ground loop isolation (since I was tired of HAVING to plug in the phone. 4L equipped car, pick up or SUV, is a simple test that can be done with just a multimeter. Car batteries can (and do) fail on their own. Kohler does make a tester for regulators part number 25 761 20-S but it will set you back about $90. Solid as a rock. The alternator puts out Alternating Current that fluctuates with the engine rpm at a rate of ABOUT 20 volts per thousand rpm. 3/10/at mileage 39,348 took car back to webster Ford found to find the alternator ground wire, in an enclosed wiring harness assembly, that had 3 separate shorts. 7 volts, you need to replace your alternator. If you don't see this kind of output,. Dim lights. This is a critical component that, when faulty, must be repaired immediately. I had an F150 that had a bad joint at a fusible link in a harness between the alt and the regulator. I assume it's not a bad ground?. P106 with no symptoms T1N Talk. Weak headlights, starter issues, check engine lights and the smell of burning plastic are all symptoms of electrical issues in your truck. An if you have a power drain your going to need to trace the source to correct it. The majority of the time a bad ground is the cause for things like that. **** when you have these symptoms, the alternator is not bad ****. The alternator also keeps the battery fully charged,. Make sure you have good ground connections at the alternator (alternator case) and voltage regulator, especially if your vehicle uses a remote voltage. If not, you probably have bad connections at the battery. You need a cheap VOM or volt meter, set it to the 20 volts DC range. If you were to install a new alternator in your vehicle, it will give you an average of 5 to 7 years of functionality before it needs to be replaced. 4 Most Common Starter Solenoid Problems And Bad Symptoms Before we discuss the starter solenoid problems and bad starter solenoid symptoms, let's figure out what is a starter solenoid first. Remove and clean all charging system electrical connections from the alternator through the batteries (this includes the ground side). 3/10/at mileage 39,348 took car back to webster Ford found to find the alternator ground wire, in an enclosed wiring harness assembly, that had 3 separate shorts. The alternator’s charging output flows through six diodes in the rectifier assembly before it goes to the battery and electrical system. Kohler does make a tester for regulators part number 25 761 20-S but it will set you back about $90. That's an incredibly important point to keep in mind, so let's read that again. Whereas alternator bad connections will just get hot, generator bad connections result in a battery not being charged. My alternator voltage used to fluctuate/pulse when the car was running. Those symptoms seem right for a dead alternator or voltage regulator. Weak or dead battery. Your problem seems clearly to be a bad ground. As the Holdens age they may develop a number of weedy- intermittent (hard to find & isolate) electrical faults. Try it, if it does not charge then try the jumper wire just be careful, connect the jumper to D+ first and when you are sure the jumper is not touching the alt. After a bit of research, I started looking into the wires coming from the plug on the side (Sky Blue and White/Red). It streamlines the manufacturing and troubleshooting aspects of electronic modules by housing the modules into one, central unit instead of each function having its own device. Ford always used internal ground fields, GM was always external ground fields. When the alternator was installed, I cleaned the eye connector on the positive lead so that probably isn't the problem. Followup from the Pelican Staff: The alternator does need a good ground. 2- The PCM code is screwed up (VERY,VERY rare) OR 3- the GRY F-Terminal circuit/wire is shorted to ground or a voltage (externally or internally in the PCM) and somehow. Another common symptom commonly associated with bad or failing battery cables is no power to This article originally appeared on YourMechanic. Even if they both look clean they could now be insulated by the coolant chemicals. Flickering or dim headlights are a strong signal 3. The Lexus guys figured this one out, the dreaded P0330 means one of two things on a 1MZFE engine: the signal wire from the #2 knock sensor is shorting to ground due to wear on the wiring harness stuck in the vibration and heat in between the heads AND/OR the sensor is truly bad. The charge indicator bulb goes out when charging system voltage exceeds battery voltage. If it DOESN'T go to 15-16 volts then the brushes are in need of replacement or you have a bad diode or two. Now that we understand what a head gasket it, it’s important to learn what head gasket failure symptoms look like to avoid higher expenses due to additional engine damage caused by driving with a blown head gasket. warning - upon initial installation of your new high amp alternator, if you have voltage readings of 12v or lower and when you increase engine rpm the voltage reading increases to 13-14v, you have a slipping belt or incorrect pulley ratio or both. But, before you condemn it, run a voltage drop test between the alternator and battery. Sat for another year and now the new owner wants me to fix it. My Alternator Light came on and I went to the auto part store where I had bought the alternator and it was tested on the car and wasn't charging so we thought the voltage regulator had gone bad within 24 hours so I took it off right there i the parking lot and they took it in and did a bench test on the Alternator and it passed the bench test. Many of us assume that our battery is dead when our car doesn't start. Dim lights. It might be only 6 years old BUT it does have 100k. If you have good stator voltage and bad voltage at the battery it's probably the voltage regulator. An easy example is attempting to draw 10 amps through a bad ground with a resistance of 1 Ohm. The meter should read continuity. *** If it is Lower than 14. Signs & Symptoms of Poor Ground Connection in an Auto Battery No-Start Condition. Heat the solder pad around the diode leg until the solder is molten, and then gently pull the leg through from the other side using pliers. This may help with the problem a bit, but it's really not a "problem". If it is, then check the amplifier ground and upgrade it. Now alternator doesn't charge at all. A short to negative ground of the excitation wire from panel to alternator might give these symptoms. However, other symptoms were pointing to a bad alternator (dashboard lighting would turn off at night, headlights super dim, battery never held a charge and I kept having to jump the car). The voltage regulator is part of the alternator. If the dashboard gradually dims, the alternator is likely at fault. However after it warms for a while the voltage drops and no current is going to the battery. However, if it is less than 13. That current is used to power your car's accessories, which can be anything from headlights to the electro-hydraulic lifts on a snow plow. It is the job of the battery to provide the power to crank the engine and start the vehicle, however, it is the job of the alternator to make sure that the battery stays charged. Boost it and it's fine once running, even with the battery disconnected (haven't tried that with a newer car yet, might not work). what it could be is a bad ground or battery connection so clean all those connections, look for corrosion creeping into the cables at the battery ends, and check and clean the ground cable connections at the engine and frame. The voltage to ground on the un-faulted phases can increase up to the phase-to-phase voltage level, so you must use adequately rated insulation systems. sent it back, they said it was bad, and they sent me another new one. I thought that noise would be a side effect of leaky diode (ac ripple). T1N Talk General Discussions related to T1N Sprinters. Joe Guilbeau's Alternator Theory Page This is an article by Joe Guilbeau on alternators & alternator theory for those used in our FSJ's. First check the battery to see if it is dead or just failing to pass current( dirty terminal or broken wire). Car batteries can (and do) fail on their own. 5 volts when your Cooper is running. Alternators are connected to a car’s battery in linkage with the starter, ignition relay, and fuse box. Bad diodes are a common cause of alternator failure. So V=10(1) thus making the voltage drop a whopping 10V. Fortunately, it's fairly easy to recognize the symptoms of a bad ground strap. The purpose of this thread is to document the symptoms and experiences with ground problems. If equipped with this fuse and the fuse IS blown, replace the fuse and retest the alternator to see if the charging voltage has gone up to 13 or more Volts. 1) Oil Leak – Obviously, the biggest and most obvious symptom will be oil leaking from underneath your vehicle. If you have a newer battery, but your car won't start, you may have a bad alternator. Bad grounds can cause really weird problems that can be hard to diagnose. A voltmeter is handy if you are familiar with how to use it to find bad connections. Failed alternator diodes, while rare, often reveal themselves as a whining noise in the alternator, accompanied by a loss of charging voltage. Go over each ground wire/strap -- check for corrosion and clean the contact surfaces. A friend said bad grounds/wiring could have killed the original alternator so I cleaned the engine block->chassis ground, the battery terminals and every wire coming off either battery terminal. A starter relay closes contacts to switch on a larger current from a small current coming from the ignition switch circuit. However, a bad alternator can cause your car battery to drain and not be recharged. It's always shorts to ground, or broken wiring. Until recently the easiest way to tell the systems apart is by looking at the plugs that connect the stator to the regulator. Also, if the battery itself is bad, an alternator in working order won't be able to charge it. Just replaced alternator again. Ran it for about a half hour to 45 mins, beat the heck out of it several times to 6300, let it idle, get up to operating temp for a while, it ran good. C4 Electrical System. I did put the car into service mode and pull the alternator. As long as you've been paying attention, nobody knows how your engine sounds better than you do, so if it starts to sound odd or even just a little different, there could be a problem. They are usually designated by amperage out put such as a 22- amp or a 32-amp system. Shortly after the battery light started to flicker then my truck died, I replaced the alternator and put the old battery back in and everything is fine since. 2005-2007 Ford Focus Alternator Problems - How To Fix Them Sometimes, by design, a certain model vehicle will have ongoing issues with a certain part. The electrical system is a 12 volt system, it might start down through 11 volts. This time I take the belt off the engine and run it without the alternator spinning. Yesterday we replaced on a Mitsubishi Town Ace Minicar the timing belt and the belts for alternator + defective belt tensioner (bearing was running rough), water pump and AC compressor and the water pump. Left unchecked, voltage drop causes countless unsolved electrical mysteries, especially when it infects the ground side of a circuit. if your stock alternator is, say, 80A you should run a 100A fuse at the most. This page will show some of the common ways to troubleshoot common faults. Traditional low-voltage (12 volt) electrical systems use a negative ground system, the "ground" almost always being the vehicle's entire chassis. Hey Carl, the alternator output is 15 volts from the post, and I verified that the case ground is good (. i replaced the alternator and my lights are still dim and only running at about 11 to 12 volts while idle and driving. Make sure the alt. Should be easy to tell. Understanding the Dodge charging system. The electrical system on the C4 generation Corvette® consists of a battery, an alternator, the ignition system, various lamps, several electric motors, an entertainment system, numerous fuses and wiring, various control and monitor modules and a large number of connectors which serve to connect the systems and devices together. The ignition switch has multiple contacts in it that feed many things if the engine is on its own it may be a place to start. If equipped with this fuse and it's NOT blown, then the alternator is bad. Six Alternator Warning Signs: 1. b) If the wire from the D+ terminal going to the clash indicator light should short to ground (even briefly) while the alternator is operating, the "diode trio" will be damaged. Radio and light issues are most common, charging systems issues, and seemingly unconnected systems impact each other because the electricity is trying to jump that last barrier to get home. The bearings on which the alternator rotates can also be at fault and hinder the alternator from providing an optimal performance. The majority of the time a bad ground is the cause for things like that. Shortly after the battery light started to flicker then my truck died, I replaced the alternator and put the old battery back in and everything is fine since. An easy way to find out is start your car and disconnect your negative terminal, if the car shuts off it's your alternator. The D- or ground connection is a metal tab out to one of the mounting screw locations, clean the circular pad as well as the mating surface on the alternator body. Looking for symptoms helps guide us to the most likely cause. Sounds like the alternator to me as well. Other possibilities include a failing voltage regulator, or perhaps an alternator pulley that is too small. Here are a bunch of other ground wires you should replace while your at it too, generally speaking you can use any thick wire with the proper hole for mounting but for those purists at heart: 12-52-1-285-011 Alternator ground cable, however I used this to ground the a/c compressor to engine block. The dash lights also flicker with bass in the car. This technique will be another tool to add to your toolbox of know-how. Symptoms of Faulty Ignition Coils. The symptoms of the fried wire is the alternator no longer charges the battery. If there is a fault with the main wire from the fuse box to the alternator, the altenator would be charging but the charge would not be getting to the batery. With regulators for the alternator system, voltage limiting is the means of controlling output. I have read several posts about bad ECM's but cannot seem to find my exact symptoms. If the diode is bad, the alternator will have a short in it and your battery will go dead. Read on to know more about the symptoms or warning signs of a bad car thermostat. battery/alternator visit workshop diy Typically you get BATTERY/ALTERNATOR VISIT WORKSHOP warning when the electrical system voltage in the car is below 12. b) If the wire from the D+ terminal going to the clash indicator light should short to ground (even briefly) while the alternator is operating, the "diode trio" will be damaged. Run engine at 2,000 rpms for tests and turn on the blower fan for the AC or Heater, the headlamps, and any other accessories that put a strain on the alternator, and watch the gauge to see if it decreases voltage or amperage. If you still cannot hear music through your system, then the amplifier may be sensing a short. Occasionally, a symptom of this issue might be brighter lights, as the alternator produces more energy to overcome the resistance in a bad wire or a. Fortunately, it's fairly easy to recognize the symptoms of a bad ground strap. Find out which repairs might help solve the problem, parts and more. If the dashboard gradually dims, the alternator is likely at fault. Unfortunately, if you drive a Ford Focus, you may already know this. I knew this wasn't the problem and sure enough just about as I was in the driveway it did it's little dance. While either of these diagnosis may be true, these symptoms may also indicate poor grounding. You need a cheap VOM or volt meter, set it to the 20 volts DC range. The same current will also be flowing in the ground path, but this may be much harder to check. The one right beside the drivers knee is easy to forget and will cause these symptoms. If the amplifier is not getting power, it will not power up at all. 2) For the turn signal issue, when the ground is lifted so the light goes off, why would that ground the alternator warning light wire causing the light to come on and only when the headlights are on? 3) When the alternator light comes on, is it shutting off the alternator? Would the excessive on and off burn out the alternator?. In this guide, we look at how much an alternator repair will cost and why it costs what it does. Your alternator runs all the electrical components in your vehicle, including your headlights and dashboard lights. A bad battery cell can cause the alternator to over-charge the good battery cells. A voltage drop of. Could there be a ground issue that is preventing the car from getting power and causing the weird charging issue? I believe the negative wire goes from the battery to the alternator, thus my thinking that it could be causing this. The voltage regulator will allow the alternator to make enough power to maintain proper voltage level, but not allow system voltage to rise to a harmful level. Weak headlights, starter issues, check engine lights and the smell of burning plastic are all symptoms of electrical issues in your truck. Car won't start, symptoms of a bad ground? Results 1 to 14 of 14 Thread: Car won't start, If alternator was bad, would the car still start? I'm not sure if the. Poor ground connections are an often-overlooked cause of low charging output and alternator failure. Warning light. The following describes two methods for performing an alternator test on a Briggs and Stratton engine. 5 volts across a connection indicates a problem. How to Tell if a Starter is Bad on your Marine Engine Posted on August 30, 2014 July 27, 2018 Author SeaStar When the starter on your marine engine refuses to crank, the engine's starter may have gone bad. The ripple came down to about 30 mVolts. If it is, then check the amplifier ground and upgrade it. If all goes well up to the component, a bad ground can make the circuit incomplete. I think that a PO had a ground problem and tried to solve it with a ground wire to the alternator. if you follow it under the battery try it goes to a main connector and there is a wire that. Below are the top 5 symptoms of an oil pan gasket leak. Wires within the alternator cut through a magnetic field; this in turn induces electrical current. Symptoms of faulty EEC Relay???? Computer voltage from pins 37 and 57 is good, replaced dizzy with Motorcraft unit with newer TFI it had on it. My car alternator runs at 16 to 16. 60 volts and when running it's at 12. Testing to see if the alternator is BAD or not, on your Ford (or Lincoln or Mercury) 4. Five Symptoms of A Bad Alternator. System working properly:. My thinking is that the burning smell was the alternator and somehow affected the grounding point. I would say alternator, Yes it is newer truck but 100K miles. Go over each ground wire/strap -- check for corrosion and clean the contact surfaces. So far, I've been approaching this car as I do a Hornet, and it's paid off, but this ground issue is a new realm of electrical trickery for me. 5 volts or more means the wire is bad. Don't make the same mistake I did. Just for the record, Case used to ship some of their combines without batteries years ago, but they had a large resistor hooked to output terminal of alternator so I was told by mechanic who worked across the street at Case dealer before we were incorporated into CaseIH dealership. Maybe a bad ground wire? Sometimes a bad ground on the block can show up after the block heats up and expands a little. Check the alternator gauge. A/Z does have some good reman parts they carry. 2- The PCM code is screwed up (VERY,VERY rare) OR 3- the GRY F-Terminal circuit/wire is shorted to ground or a voltage (externally or internally in the PCM) and somehow. we tested the alternator but it is fine at 15 amps. If you have a newer battery, but your car won't start, you may have a bad alternator. Bad switches more commonly tend to have a hard time starting up, but then will run smoothly and at full power once the connection is made. First check the battery to see if it is dead or just failing to pass current( dirty terminal or broken wire). a bad ground. An easy way to find out is start your car and disconnect your negative terminal, if the car shuts off it's your alternator. The V-Star 1100 Charging System There is a lot of issues noted online about the V*1100 charging system. I've got a 1999 Dodge Caravan mini van. The test about opening the points and closing the mentioned earlier is the best way to check if there is spark A's have a bad habit of getting a thin film. Some things ground through the wiring harnesses. That current goes to the voltage regulator, which turns it into Direct Current that the battery can use, and cuts the voltage to a steady (more or less) 13. If the voltage is closer to 14v at the alternator then there is a bad connection somewhere between the alternator and the brown at the fusebox, check the voltage on each brown wire and the battery cable at the solenoid. Here are the common symptoms: • Undercharging - This is the most common problem, and can often be caught in the early stages. I thought this was just maybe a bad ground somewhere so I didn't think much of that either (check gauges light was still on at this time). It turns off my speaker amplifier as soon as I hit the. When your alternator is working as it should, it will output 12. So V=10(1) thus making the voltage drop a whopping 10V. After two or three turns the starter with activate, I dont want to be stranded, so I was thinking of following having the battery tested but how to you test. The harnesses have ground wires and ring terminals strategically placed throughout the car. If it DOESN'T go to 15-16 volts then the brushes are in need of replacement or you have a bad diode or two. If you turn the key to start it and when it clicks all the dash lights and all the power turn off in the car and you have to turn the key back off then on again it would be a bad ground. If you have continuity, either the ground on the device is bad, or the device itself has failed open (like an internal short having melted a wire inside). Kohler does make a tester for regulators part number 25 761 20-S but it will set you back about $90. Read on to know more about the symptoms or warning signs of a bad car thermostat. Bring it to a local parts store they can usually test the alternator for free. Paint on body panels and the engine acts as an insulator, resulting in a bad ground connection. i have a serious ground on my 87 c4, turn car off return hours later battery drained i now disconnect battery, iam told that the delco stereo amp in the dashlower driver side very likely problem, there is destortion in my front speakers which some say is a sign, the speakers are not the problem, which i thought were bad speakers this is a delco bose system, any truth to this can you tell me. Volkswagen Jetta Difficult to Diagnose Electrical Issues Are Typically Due to Ground Issues - 195 reports. The Alternator should now produce a battery voltage between 14. Re: mercruiser alternator questions Howdy, Well, After you check all the engine ground and positive connections, you might remove your alternator and drop on over to Autozone, Napa, or other autoparts store and have them test it. (Depending on your connection speed, this may take a short while to load due to the number of graphics in the page). Mechanical energy is transferred from the engine to the alternator by a grooved drive belt on a pulley arrangement. A voltage regulator maintains an even flow of electrical power. It’s possible depending on what the ground wire goes to, and if its the ignition ground then it could stop it while driving and not start, and if its to the battery then it wouldn’t allow it to start but not stop while driving unless you have a bad alternator too. Even if they both look clean they could now be insulated by the coolant chemicals. This is a great video talking about common alternator failures and symptoms. After a bit of research, I started looking into the wires coming from the plug on the side (Sky Blue and White/Red). Looking for symptoms helps guide us to the most likely cause. If you want to check volt drop then use a multimeter on low volts scale (2v) when the laternator is apparently running OK to check volt drop between the big +v output terminal on alternator and the battery +ve terminal. Result: "Probably a bad alternator because it's not genuine Honda". I couldn't locate that connector but the wire colors matched the wires on the alternator. How to Test a Voltage Regulator. Weak or dead battery. Make sure you don't have a loose ground terminal on the battery as well. You headlights will do the same thing as the starter, Dead Battery. Any problems within the wires, cables or connections at either end can reduce or stop electricity from getting through. I admittedly made one assumption. So if you have info to share, chime in. check your ALT-S fuse (7. Once a good ground is restored it should go away. I'm getting the feeling the alternator isn't feeding the battery. Other less noticeable and less common symptoms include weird sounds and bad smells. 2 , the ground-fault current is controlled and normally limited to between 25A and 1,000A. Clean the battery connections and check the alternator output wire for signs of burning due to a bad connection. Car stalls bad ground VEHIX411. Testing the grounds is what they had you do. I had the EXACT same problem and situation with my gmc 1500 and it was a bad alternator. If you want to check volt drop then use a multimeter on low volts scale (2v) when the laternator is apparently running OK to check volt drop between the big +v output terminal on alternator and the battery +ve terminal. i doubt it's an alternator problem. Should be about 12 volts with engine off. It sound as if you have a bad ground somewhere that is intermittently cutting power (probably to a computer controlled system) that is shutting the engine. How to troubleshoot a bad engine block ground with just a simple test light. i doubt it's an alternator problem. Battery is good. Sounds like a dead alternator to me. 2- The PCM code is screwed up (VERY,VERY rare) OR 3- the GRY F-Terminal circuit/wire is shorted to ground or a voltage (externally or internally in the PCM) and somehow. Solid as a rock. 3/10/at mileage 39,348 took car back to webster Ford found to find the alternator ground wire, in an enclosed wiring harness assembly, that had 3 separate shorts. The symptoms include lights that glow dimly, lights that come on when others should, gauges that change when the headlights are turned on, or lights that don’t come on at all. So the alternator charges the battery so the battery can power the starter to start the car. The voltage regulator can be easily replaced without removing the alternator most of the time, and usually is cheap so worth a try. However, bad wire connections, poor ground or corroded plugs could be the other possible causes. Some of the ground experiences I've had would not lead you to a bad ground. 8 volts, then you should measure voltage at Alternator B+ and the alternator case. The ground strap will with time become loose and cause some resistance to the headlights.