How To Wire Up A Relay For A Light Bar

Before we get started take note of this relay diagram on how to wire up the switch to your led light.

How to wire up a relay for a light bar. Say you install a 40 led bar that is 30 amps for example. 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 second plug can be taped up out of the way or you could use this wire for an additional light bar. If your led light bar came with a wiring harness and it includes a relay use it end of story.

How to wire your light using a relay the relay will have 4 points on it marked 30 87 85 and 86. The diagram below shows the bottom side of a standard 12vdc automotive relay. The whole 30 amps would have to go through that switch if there wasn t a relay. On the back of the rocker switch there are 5 blades.

If you are wiring up spot lights connect a plug to each light. Best connections 12voltwire c. In this video i show you how to wire a 12 volt automotive bosch style relay. Two ground two hot and a 5th blade that goes to the relay or led.

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. I have a light bar that came with a wiring harness and switch. 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. Wiring the led light bar in front of the vehicle makes it easy for you to view objects clearly while driving at night time.

When directly switching a light bar use a switch with a minimum 10a rating. This is your guide on how to install a universal relay harness wiring set with an on off switch. This is a general installation guide on how to wire a relay harness and switch kit. 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.

Hence in this guide we have explained how to wire an led light bar without a relay. If you have no wiring harness use a relay if your light bar draws over 5 amps. 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. For this guide we will be tapping this led light bar to achieve superior lighting in dark off roading situations.

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