Product Review

If you have trouble with your 7x6/5x7/H6054 LED hedlight not working properly, problems such as dim headlights, malfunctioning headlights when using hi/lo beam, this H4 headlamp relay harness below can fix, please buy this if your car suffer from these problem, especially for Toyota Tacoma series.

H4 headlamp Relay Harness Installation Instructions are as below, also more details you can also refer to the main pictures :
The harness is plug and play and will power your lights automatically. Follow these simple steps:
1.Unravel the harness and lay it out in the front of your engine compartment
2.Make sure the side with the relays is sitting on the same side where your battery is installed (before you dress the harness into the body of your car, connect it an make sure the lights work properly)
3.The harness is equipped with a 30A fuse. Connect the red cable coming out of the fuse to the positive (+) side on your battery.
4.Connect the black, 3 prong plug on the harness to the closest car harness headlight plug
5.Connect the ground cables in each of the yellow plugs to the body of the car. You can use existing bolts or self tapping screws but verify that you have a good ground. Connect the yellow plugs in the harness to your headlights and test your low and high beams. Once you have successfully tested your lights, you can dress the harness properly to the body of the vehicle. Attach the relays to the body of the vehicle as well and verify the harness is not pinched, all bolted terminals are properly tightened and all plugs are fully connected.