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Originally Posted by yetiman
thanks...guess i'll have to yank it and have it tested
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I hope you're talking about your alternator!

(sorry man.. couldn't resist)
From what I've read/seen, bench testing is not all that accurate. Best bet is try to find a new/oem alternator. You need to see ~14VDC across the battery with the truck running (with a quality volt/multi meter).
G/luck
Joel