Question about 1994 Chevrolet G20

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Think that the regulator in the alternator is causing the engine to die. Not getting enough power but when tested alternator and started including battery are charging just fine.

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Engine barely turns over, wont start, battery dead but only 1 year old, suspect generator but dont know for sure, need quick way to test.

Posted on Nov 15, 2010

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Dome light started staying on, then the headlights dimmed and car died. 99 Pontiac sunfire


It sounds like charging system failure to me. Most likely a bad alternator. The entire charging system needs to be checked including the battery, the battery cables and connections and the alternator and alternator circuits.

Just to help you understand.....the reason your dome lamps started coming on is because they are controlled by the Body Control Module (BCM) (AKA Body Computer) The body computer did not have enough power going to it to function properly and this is what caused your dome lamps to come on (Computers do all kinds of WIERD things when they start getting delirious from malnutrition).
Then as the charging system voltage got even lower, this is what caused the headlamps to go dim. Finally, the Powertrain Control Module (PCM) (AKA Engine Computer) did not have enough power to function proerly and this caused your engine to shut down.

Diagnose and repair the charging system problem and all should start working properly again.

Nov 29, 2011 | 1999 Pontiac Sunfire

Tip

Easy way to confirm if your alternator is kicked the bucket.


You go out to your vehicle and your vehicle wont start. alternatively your driving along and the radio starts to go quieter, your headlights get dimmer, and the engine starts to lose power until the engine quits, and your forced to pull over. You try and restart and hear either a click, or get no reaction at all. The battery is dead. Darn you say, well often people think the battery is at fault. Sometimes it is, but more often its the alternator thats to blame... When your alternator is dieing the vehicle will get its power from the battery. That means all your systems are running off the battery in whole or part, including your engine. Its getting the power for the spark plugs also from the battery, which is why your vehicle will soon die, and need a jump or towed. Well an easy way to determine if its the alternator and not the battery is to get the vehicle started with a boost, then remove the cars negative (-) terminal from the battery... If the engine dies right away as soon as its disconnected then you alternator is to blame. If the engine keeps running then start looking for another cause... Warning, just because you find the alternator is the trouble, dont automatically think that the battery doesnt need to be replaced. Sometimes when one part goes wrong, it takes other parts with it... This tip is for all cars and trucks...

on Jan 27, 2010 | Chevrolet Camaro Cars & Trucks

1 Answer

What's draining my battery?


1: Faulty Battery: inspect and fill it with distilled water, if needed: battery may be shorted out

2: Alternator: the voltage regulator inside alternator will drain battery when it quits working: break unit open, and replace the regulator: or replace the entire unit with a rebuilt alternator.

3: Loose alternator belt, which slips and does not allow for enough revolutions to fully charge the battery - especially at night-time, when you are running your headlights and such.

Now, to do a test, which will tell you if the alternator has failed, in 10 minutes:

1) Simply loosen, but Do Not Remove, the battery post clamps / cables, from battery.

2) Start Engine.

3) With engine running, REMOVE both cables from battery posts (engine should continue to run) (if it does not / dies out upon removal of cables, then test no further): ensure to secure the positive post cable - wrap it with a rag, or set it on cardboard or rubber, so it does not ground: then reach inside, and turn ON your headlights: upon doing so, and highlights are ignited, if the engine dies out - if the engine quits running the instant you turn your lights on, with the battery cable disconnected off - that means that the alternator is Not Charging; that it is not producing enough current to run itself / maintain itself running / maintain the engine running; so it does not produce enough electricity to keep your battery fully charged - and, is in fact, draining your battery of any available current which was stored in it.

So, more likely then not, it's the electronic regulator / diode stored inside of the large alternator unit: but, because, your car is a 1990, the brushes on your alternator are shot anyway; so you are better off just replacing the whole unit and belt: and battery if need be.

I hope this helps somewhat: where, with ENGINE RUNNING at normal / higher idle speed, and BATTERY DISCONNECTED, and ACCESSORIES RUNNING, especially headlights and heater - the Engine Must Remain ON / Running - on solely alternator power.

In that: the battery is only required to start the car; stored energy / current for the purpose of starting the car, as supplied by the alternator - and adjusted by the regulator: a faulty regulator will fry your battery, by over-charging / allowing too much electricity to flow.

Good Luck,

Ray

Sep 18, 2011 | 1990 Lincoln Town Car

4 Answers

I have a 2003 kia spectra 1.8 liter. The alternator isn't charging the battery but when I took it off and had it tested 3 times it passed every time. The belt is tight enough and I replaced the plug...


Hi, there are 3 fuses the the alternator needs to charge the battery. These may be inside the car or in a box in the engine compartment. They are named IG1, ECU, and ALT. If you have trouble finding them, please get back to me.

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May 08, 2011 | 2003 Kia Spectra

1 Answer

Battery dead jump start runs but when i turn on light or put in gear it dies


It sounds like that not only is the battery totally dead ,due to a high very internal resistance, but that the alternator has very low output. While car is idling in neutral, the alternator has just enough output to supply the ignition circuits but once in gear and the idle speed drops there is insufficient voltage to run engine so it stalls, It is the same when the lights are turned on as the alternator cannot supply enough to run lights so engine dies without enough drive for the ignition circuits. Try another battery or install a new one. Also have the alternator output checked as it could be the cause of the battery dying in the first place because it has not been maintaining charge as you drive. The alternator problem would be caused by either worn brushes and / or a faulty electonic voltage regulator which is mounted inside the alternator with the brushes.

Oct 30, 2010 | 2001 Mazda Protege

1 Answer

The VUE wouldn't start so we got a jump. The


Most likely you have a voltage regulator on the alternator going bad. That is why one test was bad then one test was good. The voltage regulator is most likely integrated into the alternator. Replace the Alternator and that should resolve the problems.

Jul 10, 2010 | 2003 Saturn VUE

2 Answers

Have A 2003 Kia Sedona and when I turn on the head lights it dies shortly after like i unpluged battery. What do i look for or how do i fix the problem


Check and clean the battery terms..

The car dont have enough power to run the car when lights are on,, or there is a short,,

Battery needs to be tested first.. start from there

Feb 26, 2010 | 2003 Kia Sedona

1 Answer

I have a 1994 Pontiac Bonneville SSE.. won't start


It sounds like you have a short somewhere that is draining the battery...this type of thing is usually caused by a faulty voltage regulator. I recommend taking the alternator to an autoparts store to have it tested...don't be surprised if the alternator tests good; a faulty voltage regulator can and will drain a battery in a matter of hours. I am including a link where you can order a voltage regulator for your Bonneville or, while you are at the autoparts store, you can buy one there. The link will help you to see what the voltage regulator looks like so you can identify it in your engine compartment. Hope this helps, good luck!

Nov 05, 2009 | 1994 Pontiac Bonneville

2 Answers

How do I troubleshoot the charging system?


test battery and alternator battery may be loosing charge or alternator output enough to run vehicle but not enough to keep battery charged some auto stores such as auto zone/advanced auto can bench test both for free

Oct 30, 2009 | 1991 Toyota Corolla

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