How to Install and Wire an LED Light Bar

You’ve picked out a great, ultra-bright LED light bar that is just waiting to make its permanent home on your vehicle. Now what though? Many people in this situation are soon faced with the realization that mounting and wiring a light bar is not quite as straightforward and simple as it would first seem.

Fortunately, there are steps that you can follow that will have your light firmly secured and wired correctly with little time and hassle. In order to help you get your light bar installed as smoothly and quickly as possible, here is a guide to mounting and wiring an LED light bar:

Mount the Light to your Vehicle

Mount the Light to your Vehicle

Courtesy of Project LM

Before you tackle any of the wiring it is important to firmly secure your light bar to your vehicle. All of the necessary screws and washers that you will need should have come with your mounting bracket, but it is still a good idea to take inventory before you begin.

The first step after this is to secure the light itself to the mounting bracket, making sure to tighten it firmly in place. Once the light bar is attached to mounting bracket, you can now attach the bracket to your vehicle using the second set of screws.

If your vehicle is predrilled then this step is quite easy, however, you may have to drill the holes yourself. Carefully measure the position of the holes on your bracket then drill the appropriate sized holes into the same position on your vehicle. When doing this, it is a good idea to follow this wise saying: measure twice so you only have to drill once.

Wire up the Light

Wire up the Light

Courtesy of Brett Levin

Once the light is secured to your vehicle you can start wiring it up. The first step in doing this is to connect the wires from the light itself to your relay switch. Connect the red wire on the light to the red wire that is on the switch and the black wire on the light to the black wire on the switch.

To do this, you can either solder the wires together or connect them with butt-connectors, though butt-connectors is probably the easier choice unless you’re a soldering pro. Afterwards, make sure to wrap the wires in electric tape to ensure that you cover any remnants of bare wire.

Connect to Your Battery

Now that the light and relay switch are properly connected, it is time to wire the other set of wires from the relay switch up to your vehicle’s battery. Take the red wire from the switch and connect it to the positive terminal of the battery; the black wire from the switch goes to the negative terminal.

Before you do this you may want rub the terminals with something abrasive to knock off any corrosion and ensure a good, solid connection. Tighten the connectors down nice and firm and your LED light bar is ready to test.

Test your Installation

Before you get out on the road it’s a good idea to give your light one final inspection. Give the mounting bracket a good shake to make sure there isn’t any wobble. Take one last look at your wiring job to make sure that red has been connected to red and positive while black has been connected to black and negative.

Lastly, turn your light off and on a few times to make sure the switch is working like it should. If everything is in order then you are ready to go out and light up the road!