Our headlight relay wiring harnesses are made of high quality components. Harness uses approximately 12 gauge wiring for max power to your headlight bulbs and split loom for outer protection from heat in the engine bay. It hooks directly up to the car battery, thus increases the light output and able to fully power high wattage bulbs. Uses two relays for high and low beams (Relays Included).

Boost the performance of your headlights by increasing the voltage to them. Especially for high wattage halogen bulbs, but will improve any bulb by 50% or more plus increase the white light component. Heavy Duty Headlight Wiring Harness increases voltage over stock wiring making your headlights brighter and whiter. A must for high wattage bulbs. Will dramatically improve performance over thin stock wiring by giving your headlights maximum power. Increases light output of both stock factory bulbs and high wattage bulbs. Fully "street legal" and DOT compliant. Prevents costly damage such as melted headlight sockets and burnt wiring. Replacement parts available to repair damaged terminals, sockets, wiring, relays. New & Improved Wire Harness features: * 2 OEM Bosch/Tyco AMP (Potter & Brumfield) 40 amp relays (single & dual 87 outputs) * Heavy Duty interlocking relay sockets with mounting tab * Fusible link (slow reacting fuse protection) & separate fuses (fast reacting) with 12 gauge heavy duty automotive wiring * Black split loom matches OEM to protect against heat and elements * Male connector(s) to plug into existing headlight socket * (2 or 4) new heat resistant headlight sockets (depending on application) The Heavy Duty models are 14 gauge while the Super Heavy Duty models is 12 gauge and uses 4 relays. Installs without any cutting or splicing. Installs in 5-10 minutes and keeps your stock wiring intact. Draws power directly from the battery to the headlights eliminating voltage drops and improving headlight system reliability. All harnesses cover both low & high beam: