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Re: 2002 astro van 4.3 x code p1637 Whats the deal?
Here is a post I started a long time back there are known good waves and a bit of theory on this PCM controlled alternator. Taken from a 96 Buick but I just looked at your wiring diagram and the system does appear to be the same. There were some insightful res... Login to read more. ![]()
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