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Since more and more off-road enthusiasts have a keen interest in modifying their off roads, there may be one thing that they may ignore—the... How to DIY A Relay Harness for Your Lighting System

Since more and more off-road enthusiasts have a keen interest in modifying their off roads, there may be one thing that they may ignore—the relay harness. Probably, one may pay attention to their lighting system, whether the lights are bright or not. As the factory lighting system is no longer satisfy the need for off-road enthusiasts to give a ride in the wild, most of them choose to add more auxiliary lights. However, they may ignore the potential risk as they adding more lights to their vehicles—low-quality relay harness. Thus, why not do a relay harness yourselves?


wiring harness

Basically, a relay harness is make up of the certain organized set of wires, a switch, a fuse and a relay that run throughout the entire vehicle and relay information and electric power, thereby playing a critical role in “connecting” a variety of components. Power and information via The internet are like the circulatory and central nervous systems of the human body. Due to so many lighting manufacturers flooding the market, they want to make some profits from the products including the relay harness.

The materials you need are some 14 gauge wires, a switch, an inline fuse, a relay, a relay plug or terminals. You can have all the materials in any price you want and you can make sure you know exactly the quality.

First, get the light and figure out the positive and negative parts. Positive comes down to the relay which needs 5 feet of the wiring while the negative goes to the ground(3feet ) or battery negative or relay ground which needs 5 feet. (Just assume that you connect it to the relay ground as most people do)

Second, get your battery with positive and negative parts. The relay negative goes to the battery negative.

Third, make some clear clarifications about the relay. The replay has 5 connectors; 87, 87a, 30, 85 and 86. 87 goes to the light; 85 goes to the ground; 86goes to the switch (10feet) and 30 goes to the fuse (1 foot) and then to the battery positive. You can see clearly on the picture below.



Finally, the switch negative connects to the ground, while the positive goes to ignition or constant hot, which depends on where you want it to be.


wiring harness diagram

You can see clearly as the picture above. And if you do not want to do such long-time job, you can choose Auxbeam. With high-quality wirings, you will feel relieved of its relay harness. Auxbeam will never let you down.


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Renee editorrenee

I'm an editor of auxbeam lighting.com. Here in this blog, I will introduce some new products that Auxbeam released and I will also tell you something really hot related to the LED lighting.