How To Wire an LED Light Bar With Relay

It is important to wire an LED light bar correctly to ensure reliability, safety, and to avoid damaging your vehicle. Once the LED light bar has been installed it is ready for a steady supply of electrons to vanquish the darkness. Below are some tips on how to install the light bar safely.

Safety First

Unless you have a huge amount of experience with electrical components and wiring, it is vitally important to pay attention to safety and carefully follow the guidelines set out below:

1. Neutralize the battery of you truck or car as it is the ultimate source of power with potentially lethal electrons trapped in housing and looking for the first opportunity to escape. So before you do anything else, disconnect the battery completely.

2. Remove the ground terminal clamp before removing the positive clamp to reduce the risk of the battery shorting out, which could be very dangerous. This removes the risk of you, or a tool you are holding, coming into contact with metal (the body of the car) which is connected to the negative terminal. Read about Ways To Save Money On High Power LED For Projector .

3. Sizing up the Wire

You already know the amount of current required by the LED light bar which allows you to choose the right size of wire to safely feed it. Use an automotive list of wire sizes with safe current ratings to help you determine the size. Trying to push excessive current through an electric wire that is too small will result in the insulation melting and can cause a fire. Rather err on the safe side by choosing a gauge that is larger with a lower AWG for a greater margin of safety.

4. Fuse the positive side wires (from the positive on the battery terminal) to the light bar switch when wiring LED relays or switches. The fuse rating should correspond to the maximum current on that wire and not to the wire size, which, in this case, is the maximum current of the light bar.

There are three automotive wire grades: GPT, TXL, and GXL. Most local auto parts shops will only have GPT wire. The other two grades have better resistance to solvents and chemicals and a higher temperature range. If you can find these rather use them. Checkout  Bentley SUV Price.

5. Use the best quality water-tight connectors that are available in a marine store and use crimpers that are specified for them. Although good water-tight connectors don’t need electrical tape or silicone, if you insist on using it use only professional quality tape or marine grade silicone. Electrical tape should be wrapped snugly around connectors without stretching to prevent it from unraveling with time.

6. Most inexpensive relays can handle 40A current which is ample for LED light bars, even large ones. Relays are switched through a cab switch with a circuit that carries less than 1A. Therefore you can use a smaller cab switch and wire on the switch circuit of a larger light bar.

7. If the LED light bar has a wiring harness and includes a relay, use it. If there is no wiring harness and your light bar draws more than 5A, use a relay. Use a switch with minimum 10A rating when directly switching your light bar. Ensure that the power capacity of the relay exceeds the amperage on your light bar’s maximum current draw.

8. Keep wire lengths short and route the wires along the firewalls of the vehicle’s chassis and away from heat sources. Avoid splicing wires. For a rooftop LED light bar, run the wires through the frame channel of the windshield.

9. Using separate wire colors for different circuits will make them more easily identifiable. For example red from battery to relay, yellow from relay to switch, black for ground wires, etc.

This short guide should be sufficient for any handy person to wire an LED light bar, but if you are unsure about your ability, rather employ an electrician to deal with the wiring. Checkout .