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I'm wiring my car now with a Ron Francis wiring harness. They are adamant in their directions as well as in their catalog that the frame should not be used for a ground. They strongly and repeatedly emphasize that a heavy ground cable should be run from the negative terminal of the battery directly up to the starter mounting bolt on the engine. From there you run a ground from the starter bolt to the frame, and start grounding the other items in the car accordingly.
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