Question about 1998 Pontiac Grand Prix
Scan it for the codes set when the service light came on. Don't clear or disconnect the battery until you get the codes.
Start by pulling all fuses and putting back one at a time,until you find the circuit that is not timing out or going to sleep.
The best way to do that,is to put an Ampere Meter in series with either battery cable and watch your Milli Amp readings drop as things time out.
The battery I assume is fairly new.
Don't over look bad Alternator Diodes. (Don't throw parts at it,test)
Posted on Aug 03, 2010
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Posted on Jan 02, 2017
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