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All GM cars from the '60s and early '70s use this separate 12-volt lead from the positive battery terminal to feed electrical power to the entire car separate from the starting circuit. This 14-gauge wire is way too small to adequately feed the electrical demands of the rest of the car. The small wire means high resistance. We changed to a large 8-gauge wire along with a fusible link, and all the electrical components' performance improved immediately. View Related Article
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