Question about 2002 Pontiac Grand Am

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Charging system replaced both alternator and battery. Checked belts, fuses ect. No voltage coming from the alternator. Took it off and had it tested. It came back good. My question is this: on the pig tail that plugs into the alt. there are three wires, one I assume is a ground, one has voltage going into the alt. what is the third wire for and could that be the problem

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3 wires for the altenator all controll the voltage regulator. You need the ground as said and one is 5 volt constant and the other is 5 volt switched.

Posted on Oct 21, 2008

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Posted on Jan 02, 2017

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My 1998 ford windstar hasnt ran for awhile. i got the altenator tested and replaced the battery, checked the fuses in the fuse panel, tested the relays and she still has a problem keeping battery charged...


Check the fusible link between the alternator thick red wire and positive terminal of the battery with the battery disconnected. If that's OK, compare the non-running battery voltage to the running battery voltage and see that it is about 12.7 volts not running and 13.7 to 14 volts running. If you don't see the higher voltages when the engine is running, your alternator is not producing the required charging voltage. At that point you need to determine if you are getting the field voltage to the alternator rotor which is the smaller wires on the alternator. The voltage will vary with the charging demand and electrical load on the system. These voltages come from the engine control module. The belt is turning the alternator, right!

Jan 23, 2016 | Ford Cars & Trucks

3 Answers

Do I have a bad alternator?


Do you hear any squealing when you drive the car? If so the belt is slipping so yes. Replace it anyway because you don't want it to snap and Replace the battery. Retest the charging voltage you are looking for 12.7v to 13.9 if you don't have a multi meter take it to another garage and ask nicely if they could check the charging voltage most will not charge but you want the voltage NOT pass/ fail or its fine
I recommend this as some battery faults can give faulse charging readings
Adam

Jul 13, 2017 | 2005 Dodge Neon SXT

2 Answers

Battery isn't charging 1999 Buick Century Custom 3.1 V6 I replaced the battery with a brand new one, took the alternator to autozone to have it tested and it passed twice, checked the fuses in the fuse...


Hi Arkina, Have the voltage regulator inspected and checked. If that checks out fine, check the earth connections or have someone check for you. If you have a volt test meter, start the engine and connect the meter to the positive and negative battery poles, measuring the output. At idle the alternator should output about twelve to thirteen volts, increasing to about thirteen volts with an increase of engine speed. With lights and heated rear window on the output should be about thirteen and a half to fourteen volts. Regards John

Nov 03, 2013 | Cars & Trucks

1 Answer

99 grand marquis the battery light would come on and off so i replace the battery... battery light stil came on. So i replaced the alternator now the battery light comes on an stays on once my car has...


You should use a motorcraft alternator , Not aftermarket ! Do you know how to do automotive electrical circuit testing ? Voltage drop testing , How to read an use a wiring diagram to pin point places in a electrical circuit to do tests ? Do a charging system voltage drop testing , test engine ground etc...
The Trainer 47 What measuring voltage on the ground side means


Electric Testing Techniques You Need to Know
There is a lot involved in find electrical gremlins if you don't know how to test . A couple basic test with a voltmeter is usually all it takes !
Starter Voltage Drop
How to Test an Alternator

Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia




May 12, 2017 | Cars & Trucks

1 Answer

2005 Ford Freestar SEL battery light coming on


take it to an accredited auto electrician for a charging system check including the voltage regulator and wiring conditin
at idle the battery voltage will be 12-13 volts and at 2000 rpms it should be steady at 14.5-14.8 volts dc

Apr 05, 2017 | Cars & Trucks

2 Answers

Check charging system


at battery when car is running there should be at least 14 to 14.2 volts. when car is off, at battery there should be at least 13 volts at battery. if alternator is charging and reads 14 volts or a bit higher. and all the belts are tight. you may have a weak battery. check it out! have a good day !!

Nov 18, 2010 | 2004 Ford Taurus

2 Answers

Electrical Problem


CHECK FOR LOOSE OR SLIPPING BELT DUE TO DEFECTIVE BELT TENSIONER.CHECK ALTERNATOR WIRES FOR LOOSENESS OR DAMAGE.CHECK FUSE MAKE SURE ITS IN TIGHT.IF ALL IS GOOD HAVE ALTERNATOR CHECKED SOUND LIKE VOLTAGE REGULATOR GOING OUT.

May 21, 2010 | 2005 Saturn VUE

1 Answer

2000 ford zx2, battery light keeps coming on/off, had alt checked (good), battery checked (good), could this possibily be a wiring issue (short/bad connection)?


There seems to be a no charge state in this case. i recommend checking the charging system. use the procedure below to isolate this issue.

Wear protective eye wear and clothing and remove all jewelry when checking your battery and charging system. Jewelry is a good conductor of electricity and is not recommended. Most batteries wear out every 3 to 5 years and need to be replaced. Always replace your battery with an equal replacement battery to assure proper operation. Automotive batteries have a +positive terminal (red), - negative terminal (black). Electricity is stored in the battery and then supplied to the vehicle when the engine is not running. While the engine is running the vehicles alternator charges the battery for future use. (Note: never disconnect the battery while the engine is running. If the battery cable is disconnected from the battery a spark can be generated which can cause the battery to explode or a major electrical malfunction to occur.)

To check a battery surface voltage, remove the positive terminal protective cover. Connect the +positive side meter lead (red) to the positive side battery terminal. Connect the - negative (black) side meter lead to the negative battery terminal. With the vehicle not running and the car sitting over night the battery voltage should be between 12.5 and 12.8 volts.(You will need to use a voltmeter for this testing procedure)

The alternator is rotated by a drive belt driven by the vehicles engine while it is running. Electrical voltage and amperage are generated to recharge the battery and supply voltage to the electrical system of the car. The alternator is held in place with mounting bolts. There is a main electrical wire on the rear of the alternator that supplies voltage to a main voltage junction box. If your alternator is not charging properly, your battery will slowly drain down from operating all the electrical systems in your car and stop the car from running.(most non charge states will be the cause of a loose belt or a low tension rate, due to a mis-adjusted alternator. make sure you have enough tension in the belt for full rotation of the alt pulley)

Next, you will need to check the alternators output with the Amp meter.

Testing the amperage output of the alternator is good for measuring the amount (not the level) of voltage the alternator can produce. This test can be tricky because if the alternator is weak it can still show it as producing amperage. Which is good, but if the voltage is low, it will still allow the battery to go dead. To check the amperage output of an alternator an amp meter is needed. Once the meter is connected start the engine. Next turn on all electrical accessories and raise the engine idle to about 1200 RPM. The alternator should output the max amperage it was designed to produce. Example: a 90 amp alternator should output about 88 amps. Note: An alternator cannot sustain maximum output for long periods of time. If the alternator is forced to operate at maximum output it will overheat and fail. An alternator is designed to operate at max amperage output only for a reasonable amount of time.

((Connect the voltage meter lead the same way you would in a battery static voltage check, Start engine (do not drive) at engine idle the voltage should be between 13.6 to 14.3 volts. If not the alternator may need replacing.)))

Nov 02, 2009 | Ford ZX2 Cars & Trucks

1 Answer

Charging System issue!


I had a simular problem, and I have worked on cars for 37 years.
In my case it was the ecm. I tested and tested, come to find out, at higher rpm's, (when car is being driven), the ecm caused the voltage regulator to stay in a high charge situation, which burnt up the alternator, changed it, and was fine.
I'm not saying it will work in your case, but you tried everything else.

Apr 23, 2009 | 1990 Honda Civic

4 Answers

Battery light on


this means you are using battery satnavs can drain the battery very fast also interia ligths

Jan 25, 2009 | 2004 Pontiac Grand Am

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