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franken · 05-09-2015, 09:29 PM

Did you forget to ground the body?
All current flowing from a source has to flow back to it. Since the body and frame are part of the circuit, they have to be electrically tied to the negative side of the battery, as does the alternator case.
The big red/+ battery cable goes to the starter. The big black/_ cable goes to the block.
Then smaller wires ground the block to frame and/or body and there's often another small ground from the battery to a fender or core support. Then there are ground straps from the body to frame, etc.
When the truck was new there was no rust. Now there may be no or poor electrical connections.

05-09-2015, 09:29 PM	#3
franken Registered User Join Date: Jun 2013 Location: Somewhere Posts: 3,160	Re: I really hate electrical. Help? Did you forget to ground the body? All current flowing from a source has to flow back to it. Since the body and frame are part of the circuit, they have to be electrically tied to the negative side of the battery, as does the alternator case. The big red/+ battery cable goes to the starter. The big black/_ cable goes to the block. Then smaller wires ground the block to frame and/or body and there's often another small ground from the battery to a fender or core support. Then there are ground straps from the body to frame, etc. When the truck was new there was no rust. Now there may be no or poor electrical connections.