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You have the basic OE setup. Heavy guage ground from negative to the engine for starting and charging current. Lighter ground to the body/frame for current coming from lights and some accessories. Unless you are dealing with a C, its unibody so body and frame are welded together with good electrical connection between the two. There is sometimes a supplemental medium guage ground strap from engine to frame as backup. Beyond the possible engine-frame supplemental strap, I wouldn't sweat it.

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Sorry I didn't clarify earlier but this is an 80 Ramcharger. Giving it a cursory thought, the only ground the body has is through the smaller gauge wire at the core support. I don't mind overkill, so I think I'll plan a 4 gauge from the rear of the block to the firewall and perhaps one from that point to the frame. Can't hurt, right?

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I use two # 2 ground straps from the motor to the front sub frame on my street car with elepahant ears plus the grounding from the battery to the body with the battery in the trunk, you can never have to good of a ground path, right