A relay is an electrical switch that lets a low current circuit control a high current circuit such as a large LED light bar. ... If you are using a light pod that does not have a very large amp draw, you may not need a relay switch, but if you are using a larger LED light bar, they are a must have.

Why is a relay needed for LED light bar?

Relays can be used to switch a low-current trigger to high current, switch a circuit on or off, reverse polarity, and much more. When adding LED lights, such as off-road light bars, driving/work lights, or other auxiliary lights to a vehicle, you must add a circuit to power the light adequately.

What type of relay do I need for a light bar?

MICTUNING 12V 40A relay is a great replacement for light bar and suitable for most LED light bar wiring harness kit.