Connect this to a solid metal part of the car body (chassis ground) or the negative battery terminal.
Pro Tip: For legal and safety reasons, many tap this from the so the fog lights only work when your lights are on. Component List
Connect this to the positive wires of both fog lights.
Connect this to your cabin switch .
How to WIRE A RELAY to a switched circuit for auxiliary lights
Using a standard automotive relay (often labeled 30, 85, 86, 87), follow this scheme:
The other side of the switch should be connected to a .
Connect this to the positive (+) terminal of the battery.