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1986 Pontiac Fiero

Tiny
CNEAL3
  • MEMBER
  • 1986 PONTIAC FIERO
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 1,253,877 MILES
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.
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Friday, December 3rd, 2010 AT 12:27 PM

3 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
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)
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Friday, December 3rd, 2010 AT 12:31 PM
Tiny
BUDDYCRAIGG
  • MECHANIC
  • 2,262 POSTS
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.
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Wednesday, December 8th, 2010 AT 11:04 PM
Tiny
BUDDYCRAIGG
  • MECHANIC
  • 2,262 POSTS
**** = k n o b
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Wednesday, December 8th, 2010 AT 11:10 PM

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