Question about Pontiac Grand Prix

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Wiring diagrams alternator

I have a big electrical problem. The biggest problem is it seems to be intermittent. I start the car and get a "charging system failure" on the info center. The alternator and battery have both been replaced. The new alternator bench tested at 12.5 volts, but when installed in the car it is reading almost 19 volts. I have idiot lights flashing on and off in the car, the amp cuts out when the headlights turn off, then comes back right after, and if the cruise control is on and i roll up the window or turn on the rear defog, the cruise control cuts out.

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  • Pontiac Master
  • 11,469 Answers

Http://www.bbbind.com/free_tsb.html free diagrams here . Enter the vehicle info. Year , make , model and engine size . Then click on engine in system , then charging system in subsystem . Click the search button , then on the blue link .

Posted on May 01, 2017

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6ya6ya
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Posted on Jan 02, 2017

justuscc
  • 360 Answers

SOURCE: battery isn't charging

here ya go check for power to the alternator good luck ............ justuscc Charging & Starting System Wiring Circuit - VIN K 41908702

Posted on Oct 16, 2008

nascarschool
  • 54 Answers

SOURCE: Volvo 240 wont hold charge

if with the volt meter the amps go down while running and at increased rpms than your alternator is not charging right

Posted on Mar 11, 2009

  • 58 Answers

SOURCE: headlights are draining my battery

sounds like you have a shorted wire somewhere.

Posted on Jun 28, 2009

  • 583 Answers

SOURCE: Will not charge

you will get some funny answers from some of these "experts " The symptoms suggest to me with out much doubt that the regulator is not doing its job correctly ,consistently.Iwould take it to an AUTO ELECTRICIAN and get it tested in situ.... there is only 4 things it can be , wireing ---battery---alternator-----regulator and of those the reg. is the only one that chops and changes. it will cost little for a sparky to check the reg ,. AND I WOULD LIKE TO KNOW THE OUTCOME

Posted on Oct 22, 2009

jturcotte
  • 8172 Answers

SOURCE: 2004 F350 dually crewcab turbo

Below is your wiring diagram. So does the battery run down or not? At 12 volts, the battery should run down. Here are a couple things to check. The grey 20 gage fusible link from the battery to the alternator runs the stator coil. You could try jumping that with a regular 14 gage wire to see if the voltage will jump up (should be at least 14 volts). The other thing is with dual batteries (which I think you have), if one battery is bad, it could pull down your voltage. Try unhooking the negative terminal on one battery at a time to see if the voltage increases. Let me know if you have any questions.


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Posted on Dec 06, 2010

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