Gauges Replaced On A 1973 Chevy C10 Digital Multimeter Tester
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11. We used a digital multimeter tester to locate a wire in the original gauge harness that provided 12 volts when the headlight switch was in the "on" position. It turned out to be a brown wire. We also ran the ground directly to the factory ground location on the driver's side of the dashboard mount and found our 12-volt ignition power source at the fuse box. The fuel gauge is wired to the stock in-tank sending unit on our truck. Our wire harness under the truck is trashed so we just ran a new wire to the tank. View Related Article
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