2000 Pontiac Grand Prix eletcrial

Tiny
MANDY CANDY
  • MEMBER
  • 2000 PONTIAC GRAND PRIX
  • 3.8L
  • V6
  • FWD
  • AUTOMATIC
When I turn my heater on my lights go off why would that happen
Thursday, March 13th, 2014 AT 10:09 AM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,916 POSTS
Have the charging system tested. GM has a very poor generator design with a high failure rate. If yours is defective, to reduce the number of repeat failures, replace the battery at the same time unless it is less than about two years old.
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Wednesday, March 19th, 2014 AT 3:20 PM

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