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Re: 2002 astro van 4.3 x code p1637 Whats the deal?
Posted to Technical Discussion Forum on 3/14/2007 1 Reply

Sorry, I didn't know what you had done so far or what you knew, so I thought I'd point that out for starters.

The 'L' terminal is a PCM output that enables the regulator to activate. It does not regulate the charge. The 'F' terminal is a PCM Login to read more.

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