sounds like theres a short to ground somewhere. give your wires a good look over if you can't see it then disconnect the ground wire hook up a test light to the negative terminal, and press it on the negative wire. if it lights up you have a drain, so you get the pleasure of chasing an electrical issue.
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2000 Tahoe Z71 5.7
1982 Z28 Pacecar 305
1999 S10
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