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By ground, I meant the one from the battery to the frame and then to the engine block. I'd take it off and clean the area at the frame. The original ones were one piece from the battery to the block with a lug in the middle for the frame, but many have been replaced with two different wires. Oil and dirt gets between the lugs at the frame, making a poor ground.
I think in 65 power went from the alternator to the ammeter and then to the lights and ignition switch. Once power comes out of these, there's a ground for each item. It's not likely that any one thing would draw enough power to make the ammeter bounce in big swings.
Terry64HT
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