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1998 grand prix gtp wierd problems please help
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jenniek513
New User
May 26, 2009, 8:44 AM
Post #1 of 5
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1998 grand prix gtp wierd problems please help
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I have a 1998 grand prix gtp, i have replaced the alt, new battery, and starter, the car starts fine, it will drive fine for about 10 mins, then it slowly shuts down. the radio dies first then the interior lights dim till they are off, my gages go down then the whole car completely shuts down.... i have replaced the alt 3 times i have no idea what to look for next please help any suggestions would be great... i just dont want to go broke guessing...
pontiac
98 grand prix gtp
4 door
3.8 supercharged
102k miles
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Hammer Time
Ultimate Carjunky
/ Moderator
May 26, 2009, 11:30 AM
Post #2 of 5
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Re: 1998 grand prix gtp wierd problems please help
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Have you ever actually tested the charging voltage? That's where you have to start. Use a digital voltmeter and read the voltage across the battery with the engine idling and no accessories on. You should have between 13.5 and 14.7 volts. Let me know what the voltage is.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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jenniek513
New User
May 26, 2009, 11:56 AM
Post #3 of 5
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Re: 1998 grand prix gtp wierd problems please help
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its over charging the alt and burning up the alt.
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Hammer Time
Ultimate Carjunky
/ Moderator
May 26, 2009, 11:58 AM
Post #4 of 5
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Re: 1998 grand prix gtp wierd problems please help
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What is the charging voltage at the battery?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Loren Champlain Sr
Veteran
/ Moderator
May 26, 2009, 5:53 PM
Post #5 of 5
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Re: 1998 grand prix gtp wierd problems please help
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Jennie; In addition to Hammer's suggestion, have the battery re-tested. Even though it is 'new', could be defective, causing the alternator to 'overwork'.
Loren
SW Washington
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