Our famous wiring harnesses are made of great quality. Every harness uses heavy gauge wiring 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 withstand high wattage bulbs. Uses two relays for high and low beams (Relays Included). You won't be disappointed!

Boost the performance of your headlights by increasing the voltage to them. Our Heavy Duty Headlight Wiring Harness increases voltage over stock wiring making your headlights +50% brighter or more and whiter color light.

A must for high wattage halogen bulbs. Will dramatically improve performance over thin stock wiring by giving your headlights full/maximum power. Increases light output of both stock factory bulbs and high wattage bulbs-the higher the wattage the bigger the improvement. Can also be used to boost power to H.I.D. Xenon ballasts with startup/flickering problems from insufficient power.

Fully "street legal" and ECE/DOT compliant for use anywhere in the world.

Prevents costly damage such as melted headlight sockets, burnt wiring, and damaged electrical switches. Replacement parts available to repair damaged terminals, sockets, wiring, relays.

New & Improved Wire Harness features:

• 2 OE/OEM Bosch/Tyco (AMP/Potter & Brumfield) 40 amp relays (single or dual 87 outputs)
• Heavy Duty interlocking relay sockets with mounting tab
• Fusible link (slow reacting fuse protection) & separate blade fuses for low & high beams
• 12 gauge automotive wiring for main power
• Black split loom matches OEM to protect against heat and elements
• Male connector(s) to plug into existing headlight socket
• (2 or 4) new headlight sockets (depending on application)

The Heavy Duty models are 14 gauge and use 2 relays (each relay can handle 260 watts) while the Super Heavy Duty model uses 4 relays.

9005 & 9006 (both in one) HEADLIGHT WIRING HARNESS features our "bright box" feature by keeping the low beams on when high beams are engaged.

Installs without any cutting or splicing. Installs in 5-10 minutes and keeps your stock wiring intact. Only tool needed is to connect to positive & negative terminals on battery.  Draws power directly from the battery to the headlights eliminating voltage drops or uneven voltage (one headlight dimmer than other) and improving headlight system reliability. All harnesses cover both low & high beams: