12-18-2010, 08:21 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Of course you are taking the readings right off the battery poles and not from the cable clamps, right? Bad connections are the first suspect. No chance of a slipping serpentine, right? That's the second culprit with an intermittent charge light. Assuming you want to do a parasitic check, I PDFed the pages from my GM service manuals. You can download them here: http://208.255.159.239/drain.pdf but here's a snap of the critical calculation for current draw depending on your battery specs:
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