How To Wire Up A Relay For A Light Bar

This video covers both 4 and 5 pin 12vdc relays.

How to wire up a relay for a light bar. If you do not install a relay and use a switch you could end up overheating the switch melting the wires and reducing the current that is getting to your lights making them less bright. If you have no wiring harness use a relay if your light bar draws over 5 amps. I have a light bar that came with a wiring harness and switch. If you are wiring up spot lights connect a plug to each light.

In this video i show you how to wire a 12 volt automotive bosch style relay. The second plug can be taped up out of the way or you could use this wire for an additional light bar. The diagram below shows the bottom side of a standard 12vdc automotive relay. Best connections 12voltwire c.

I want to remove the factory switch as i am running multiple light bars and use a third party switch panel with 6 rocker switches run in a series. The relay allows you to use the switch with a low power signal instead of having to send all those amps through your switch which would be a problem for larger light bars etc. If you are wanting to wire your light bar in such a way that is controlled with a separate switch on your dashboard all you have to do is leave the wiring harness set up the way it is cut the wire coming to the 30 prong and wire it either to your high beam led or backup light wire. Now with the plugs that connect to the lights if you are using a light bar only one of the plugs needs to be connected.

On the back of the rocker switch there are 5 blades. This is a general installation guide on how to wire a relay harness and switch kit. Two ground two hot and a 5th blade that goes to the relay or led. Hence in this guide we have explained how to wire an led light bar without a relay.

For this guide we will be tapping this led light bar to achieve superior lighting in dark off roading situations. The whole 30 amps would have to go through that switch if there wasn t a relay. Before we get started take note of this relay diagram on how to wire up the switch to your led light. These instructions apply to any car but for the sake of this guide we will be using the ford f 250 as a reference car to wire an led light bar.

Wiring the led light bar in front of the vehicle makes it easy for you to view objects clearly while driving at night time. How to wire your light using a relay the relay will have 4 points on it marked 30 87 85 and 86. Say you install a 40 led bar that is 30 amps for example. If your led light bar came with a wiring harness and it includes a relay use it end of story.

This wiring kit will work with any led light product such as the ford f 150 led light bar and makes them easy and safe to work with.