Question about Pontiac Grand Am

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My 2000 grand am alternator will not hold a charge it been replaced 3 times along with 2 batteries. Some one told me to check the relay controls where would that be located?

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GM alternators are internally regulated. There aren't any relays or external controls for the alternator in this car. The alternator in this car only has 3 wires connected to it. The first wire is the output wire, and it is connected directly to the battery. Strictly speaking, the car should charge the battery with only this one wire connected. (GM alternators are sometimes called one-wire alternators because you only need to hook up one wire for them to work). The other two wires are for diagnostic purposes. The engine computer uses signals from those wires to know when to illuminate the battery light in the instrument panel.

You could have a problem with the output wire. I would check that first. There is a stud sticking out of the alternator on the side opposite the pulley. A connector on the output wire goes onto this stud and is held in place with a nut and locking washer. This wire probably runs to the starter solenoid, but it could also run directly to the battery positive terminal. Just make sure to disconnect the negative battery terminal before you try to test this wire (to avoid shorting the battery + and - terminals together). Clean the connectors with a stiff wire brush and put some silicone grease on them to prevent corrosion. If you have a multimeter, you can check for continuity through the wire, but this may not find all faults (because a multimeter only puts a tiny bit of current through the wire to test for continuity, but the alternator puts ~100 amps through the wire.)

One bad thing about GM alternators is that they are generally not very reliable. If the wire checks out, I would suggest you have it tested. Most auto parts stores have equipment for this purpose. Even though you have replaced it 3 times, it may be bad. Just be sure to buy one with a lifetime warranty (and keep the receipt) because chances are that you'll need another one some time soon. (For what it's worth, my car is on its 4th alternator.)

Posted on Jul 28, 2009

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Not charing


95 GC (this car the ENGINE PCM/ECU controls charge at all times.)
this year, the alternator is not a Standalone ALT> no internal reg.
my CHARGE lamp is on, is it? ah, Check battery above is not a verb its a lamp glowing. gotcha.
The system is called that a charging system
you connect any any voltmeter to the car battery
it must read 13.3 to 15v. running or the charge system is in failure mode.
top reasons,
1: bad batteries, yes, the Alternator reg, might just give up on a bad battery and just not attempt to charge it. so try that first. and the'
battery is the #1 failure on all cars...
corroded battery terminals or cable or alternator not grounded do to corrosion.
2: Fuse 6 or 8 blown in the PDC, both 60amp huge fuses.
3: bad wiring. bad connections to any of the alternators 5 connections.
5: the ASD relay can kill the ALT field current. as can the PCM.
6: bad ALT.
7: bad PCM.at pin C141.

i recommend (DIY) the FSM tests. or alldata.com .

there are test on car for each type failure.
id start with battery.

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moz-screenshot.jpgmoz-screenshot-1.jpg Removal & Installation

3.0L Engine
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