wiring or ground? on 1995 Buick Regal

Ok i have a 95 regal gran sport. we bought a new alternator and have been through 3 batteries. The battery keeps draining, and had alternator tested it is good. Also, since this problem my rpm's are flipping out and now my speedometer is stuck. Do you have any idea what is wrong?

by in Mc Leansboro, IL on March 09, 2013
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