Ironwalls H4 Relay Wiring Harness – Headlight Brightness Booster For Peterbilt & Kenworth T800 W900

This Ironwalls H4 relay wiring harness is made to boost your headlight brightness on big rigs like Peterbilt and Kenworth T800 and W900 models.

It works with H4651 and H4652 style lights.
Basically, it pulls power straight from the battery with a heavy-duty relay, so your headlights get full voltage instead of going through the old factory wiring.
That means way brighter low and high beams – huge difference at night.

Rated for 12 volts and 80 amps, so it's plenty beefy.

The box measures about 17.
6 x 11.
3 x 7.

6 cm, and it's all new in the box.
Installation is pretty straightforward if you're handy with wiring – just plug and play with the H4 connectors.

Great upgrade for older trucks with dim headlights.
Makes driving at night way safer.

Built tough for the vibration and heat of a diesel rig.
No more squinting down dark highways.

Get this harness and actually see where you're going.