1986 Pontiac Fiero

1986 PONTIAC FIERO
1,253,877 MILES • 6 CYL • FWD • AUTOMATIC
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CNEAL3
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I have a 1986 Pontiac Fiero with a 2.8L V-6. I have changed my alternator 3 times and the car will run when the battery is disconnected, I am aware of the damage it could cause the alternator, but it also drains and does not charge my battery. I am unsure where to begin with resolving this issue.
Dec 3, 2010 at 12:27 PM
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MHPAUTOS
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Have the alternator tested for a faulty diode in the regulator, this can cause a drain back, also a current drain test will help,tart here.

mark (mhpautos)
Dec 3, 2010 at 12:31 PM
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BUDDYCRAIGG
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If it takes a day or so to drain the battery I have two things to check.
1 open the front and watch the ****s on the headlight motors. see if one of them twitches about every 20 seconds or so.
2 take the trunk light out and see if the battery stays up.
Dec 8, 2010 at 11:04 PM
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BUDDYCRAIGG
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**** = k n o b
Dec 8, 2010 at 11:10 PM