4 Headlight Relay Harness H4 6"x4" 4651 4652 4656 on 2040-parts.com
Stephenville, Texas, US
This headlight relay harness is used for brightening the headlights on a classic or muscle car. Almost any car that has sealed-beam headlights can benefit from this Plug and Play relay harness. By pulling power straight from the battery, your halogen upgrades will be able to shine their brightest without damaging your existing wiring and switches. The harness has an in-line 40-amp fuse with dual 80-amp relays capable of handling up to 100-watt bulbs for a total of 400-watts. The plugs that attach to the headlight are ceramic and will not melt like some of the stock plugs. This harness will work with any 4 headlight system with standard H4 plugs like 4651, 4652, 4656, 4000, 5001, and 5006.
Installation Instructions:
- Remove battery cable.
- Unbundle the wiring harness and straighten out wires.
- Attach the relay to inner-fender or radiator support close to the battery.
- Detach the stock headlight plug on the battery side and attach it to the male plug on relay harness. This should be the headlight with high and low capability (three spade plug) normally on the outside.
- Attach the ceramic plug (three wires) with the shortest wiring to the headlight that you just detached the plug from and attach ground wire.
- Detach the stock headlight plug from the high only bulb and isolate or wrap with electical tape because it will not be used.
- Then attach the other plug (two wires) to the high-only bulb and attach the ground wire.
- Stretch the long wire across the radiator to the headlight pair on the other side.
- Detach the stock headlight plug from the high-low headlight and isolate or wrap with electrical tape because it will not be used.
- Attach the ceramic plug (three wires) into this headlight and attach ground wire.
- Detach the stock headlight plug from the remaining high-only headlight and isolate or wrap with electrical tape because it will not be used.
- Then attach the other plug (two wires) into this headlight and attach ground wire.
- Secure the harness using included cable ties.
- Attach Red wire on harness to positive battery cable.
- Attach battery cable.
- Test headlight functionality.
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