Engine Compartment Wiring.Step 1. Turn on your headlights and check which one is not working. Turn off the headlights. Prop open the hood with the hood support rod.Step 2. Loosen the negative battery terminal nut with your crescent wrench. Lift the negative battery cable off of the terminal.Step 3. Disconnect the wiring harness on the rear of the headlight assembly. Check that the contacts are clean on the headlight socket and theStep 4. Brush the top layer of corrosion away with the pencil eraser. Spread a dollop of dielectric grease on the contacts for the wiring harnessMore items How to Repair Headlight Wiring | It Still Runs Is this answer helpful?Thanks!Give more feedbackThanks!How can it be improved?How can the answer be improved?Tell us how Headlight Wire Harness - AutoZone Equip cars, trucks & SUVs with Headlight Wire Harness from AutoZone. Get Yours Today! We know our parts and products. headlamp wiring harness | eBay Find great deals on eBay for headlamp wiring harness. Shop with confidence. Skip to main content. eBay Logo: Headlight Wiring Harness with Fog 1999 - 2005 VW MK4 Golf GTI OEM Components See more like this. Dorman 645-205 Headlight Wiring Harness Lifetime Warranty New. Brand New.