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hello, i installed a NOCO IGD-140HP battery isolator on my 1994 chevy blazer 4x4 350 and it doesnt seem to be charging, had alternator and batteries tested at autozone and checkers and they said they were still good, batteries are only 6 months old, and they are the same kind, how do i tell if i have a delcotron alternator? how can you tell if the isolator is still good? whats the right way to hook up? need help thanks
 
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