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Heavy Duty Headlight Wire Harness
 

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.

9005 and 9006 Wire Harness

9004 and 9007 Wire Harness

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:

The Heavy Duty models are 14 gauge while the H4 Super Heavy Duty model is 12 gauge (again this model is available only for H4) 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: 

Disclaimer:

Some vehicles may require additional parts or modification for harness to operate. Please test harness by attaching to battery and grounds before securing wiring and mounting relays to vehicle.

For vehicles with dual batteries (such as the Ford Super Duty) it is recommended that 2 universal wire harnesses be used to connect to each battery. This will result in slightly higher power output and prevents the factory fog lights from staying on and a neater engine compartment since there is no wire run across the radiator.

 

 

 

 

 

Universal wire harness

$55 Plus $8 shipping and handling via UPS Ground (1-7 days) - Please select the correct size and fill in the information

Size
Year, Make and Model


 

If you are purchasing the H1 & H1 for the Honda Prelude, or GM low beam on when high beams are engaged. - $55 Plus $8 shipping and handling via UPS Ground (1-7 days)

Year, Make and Model

 

Toyota Truck/SUV/Van (Tacoma, Tundra, Sequoia, Sienna, etc) models (2001 and up) require two separate wire harnesses which may be necessary on some vehicles (i.e. Super Heavy Duty with 4 relays) and higher output.  - $65 Plus $8 shipping and handling via UPS Ground (1-7 days)

Year, Make and Model

 

9004/9007 (Dual battery Super Heavy Duty Wire Harness with 4 relays)  - $90 Plus $8 shipping and handling via UPS Ground (1-7 days)


 

9004 to 9004/9007 Dodge Ram Super Heavy Duty Conversion Harness with 4 relays - $125 Plus $8 shipping and handling via UPS Ground (1-7 days)


 

 

 

 
Replacement Parts
 
Relays
4 pin (30, 85, 86, 87 terminals)12 volt 30 amp $5/each
5 pin (30, 85, 86, 87, 87a terminals)12 volt 30 amp $5/each
5 pin (30, 85, 86, dual 87 terminals) 12 volt 40 amp by Bosch NO tab  (made in Germany) $9/each
5 pin (30, 85, 86, 87, 87a terminals) 12 volt 30 amp by Bosch (made in Germany) $6/each
Relays sockets
Standard 4 pin or 5 pin without wire attached $5/each
Size
Standard 4 pin or 5 pin with 2 feet wire attached $7/each
Size
Heavy Duty interlocking 5 pin without wire attached $7/each
Headlight sockets (male or female) (The male headlight sockets match the end of the headlamp bulbs, the female sockets match the factory headlight socket.)

$5/each
Socket Size
Type
 
 
Additional Information:
Not sure what bulbs my vehicle requires? (by Sylvania.com)
When should you use a wire harness?
General Installation Instructions for Heavy Duty Headlight Wiring Harness
Why for vehicles with dual batteries, it is recommended that 2 wire harnesses be used connected to each battery?

How to reverse a socket?

Bosch Relay 5 Pin Specification Sheet

Standard/Heavy Duty relay sockets Specification Sheet

How should I mount the relay for the wire harness?