Amazon: h4 headlight harness wwwon›Search›h4 headlight harnessKASLIGHT Ceramic H4 Scoket, Pair H4 Harness, 4x6 Led Headlights H4 9003 HB2 Wiring Harness, H4 9003 HB2 Harness H4 Wiring Harness H4 to 3 Pin Adapter H4 Headlight Harness, Fix Un-standard H4 Plug Pins. by KASLIGHT. $8 $ 8 99 Prime. 4.5 out of 5 stars 34. H4 LED Headlight Conversion w/Heavy Duty Wiring Harness Headlights include a pair of our new 6000K bright white LED H4 conversion bulbs. Lights are DOT and SAE approved. This kit also includes a Heavy Duty Headlight Harness to upgrade your stock headlight wiring harness for maximum light output and stability.