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1998 grand prix gtp wierd problems please help Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Automotive Wiring and Electrical jenniek513 New User May 26, 2009, 8:44 AM Post #1 of 5 (1520 views) 1998 grand prix gtp wierd problems please help Sign In 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 Hammer Time Ultimate Carjunky / Moderator May 26, 2009, 11:30 AM Post #2 of 5 (1512 views) Re: 1998 grand prix gtp wierd problems please help Sign In 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. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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. jenniek513 New User May 26, 2009, 11:56 AM Post #3 of 5 (1509 views) Re: 1998 grand prix gtp wierd problems please help Sign In its over charging the alt and burning up the alt. Hammer Time Ultimate Carjunky / Moderator May 26, 2009, 11:58 AM Post #4 of 5 (1506 views) Re: 1998 grand prix gtp wierd problems please help Sign In What is the charging voltage at the battery? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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. Loren Champlain Sr Veteran / Moderator May 26, 2009, 5:53 PM Post #5 of 5 (1495 views) Re: 1998 grand prix gtp wierd problems please help Sign In 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   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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