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Registered
Join Date: Jul 2008
Location: Central Washington State
Posts: 4,412
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Dirty ground would be the first place I look at. 12.6 is a bit low; fully charged without any load or draw, the battery should read at least 12.8. Check your negative battery connection (clean and tighten) as well as the negative ground strap where it connect so the transmission.
Even a low battery @ 12.6, you should have at least low draw things working, like dome and gauge lights, stuff like that. With a bad connection, once you put serious draw on things by cranking the starter, the voltage will drop to where nothing will work.
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, B&B intercooler, stock 3LDZ.
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