What Are Each Wire Color for the Headlight Wire Harness In the diagram, the top wires are voltage, bottom wires are ground. The dimmer switch is part of the ground circuit, if you wan t to word it that way. The low beams ground through the headlamp relay in diagram. The high beams ground through dimmer switch ground. The ground wire location is the same for high and low. Sorry it took so long. Chevrolet S10 Wiring Harness – Wiring Harness for S10 Headlights & Lighting. See all Headlights & Lighting. Engine Thinking of replacing your Chevrolet S10 Wiring Harness? Order now and get to choose from a huge product selection backed by the best brands in the market. $43 $12.03 Delphi DPFA10003 Fuel Pump Wiring Harness How to Repair Headlight Wiring | It Still Runs How to Repair Headlight Wiring by Matt Scheer . For most vehicles, the headlight circuit features four main components: the headlight bulb, the wiring harness (brings power to the headlight bulb) and the fuse (protects the circuit from power surge damage). If any of these components are damaged, the headlight circuit may not work.
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