Headlight Wire Harness - AutoZone Equip cars, trucks & SUVs with Headlight Wire Harness from AutoZone. Get Yours Today! We know our parts and products. Headlight Wire Harness | AutoPartsWarehouse Headlight Wire Harness Products. Want a headlight overhaul? You will need a new headlight wire harness. The correct harness can improve the overall performance of the different headlight parts and increase the lighting output of the headlights. Some harnesses are designed to complement higher performance bulbs.