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  1. #1
    Junior Member 1999TransAmWS6's Avatar
    Join Date
    Jun 2007
    Location
    New Lenox, IL
    Posts
    5

    Red
    1999 Pontiac Trans Am

    99 Trans Am Battery/Charging System Problem

    Hey everyone,

    I'm having a problem with my 99 Trans Am. It just started about 2 weeks ago and no changes have been made before it began happening. If my car sits for 8 hours or more, the battery is too drained to start the car. The battery is about 1 year old. I also replaced the alternator last week. All connections look good. I took it to 2 different places to have a system check. Alternator is 14.0 volts......battery tests good......system draw with car off passes at about 0.1amps. I do get an occasion DTC code of
    P1637 Generator L-Terminal Circuit.

    Any help is greatly appreciated!

    Thanks in advance.

  2. #2
    Member ultra_badass's Avatar
    Join Date
    Mar 2007
    Location
    Corpus Christi
    Posts
    257

    navy blue matallic
    2000 WS6 trans am M6

    wow that is a prob...if it passes the amp test the only thing i could think of is bad battery it does happen and about the code i have the same code in mine it doesnt throw the SES light but its in there im not much worried about it yet ...good luck man

  3. #3
    Junior Member 1999TransAmWS6's Avatar
    Join Date
    Jun 2007
    Location
    New Lenox, IL
    Posts
    5

    Red
    1999 Pontiac Trans Am

    Yeah, it's pretty frustrating. I'm still thinking it's the battery too. I have a 95 Trans Am with the same battery and about the same age so I swapped them tonight to see if the problem stays with the car or the battery. Thanks for your help.

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