Originally Posted by FireRanger

I made this to serve as reference for one of the most frequently asked questions. HOW DO IT WIRE MY FOG LIGHTS (or driving lights or off-road lights). The following three schematics in plain english should illustrate how to properly and safely wire accessory lights to your vehicle.
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Schematic #2: Rather than using a switch, this will synchronize your accessory lights with one of your truck's stock lighting systems. I personally have my off-road lights setup like this so they come on/off with my high beams. You can use anything you want.



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Schematic #3: This is a combination of both. You have a three-way switch in the cab. The switch's positions are basically ON-OFF-AUTO. With the switch on, you get lights on no matter what. With the switch off, the lights are off no matter what. With the switch in auto, they will work like #2 and follow the existing high or low beams or whatever you choose.



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All wire-to-wire connections should be made with automotive butt connectors. It is good to put some silicone RTV in the ends to seal them up from the weather. Do not use household wire nuts!


The relays can be connected using insulated female spade connectors. Do NOT use uninsulated connectors and put some silicone RTV on them to seal them up.



Make sure the fuse holder for the 10-12 gauge wire is also rated for that current. You can't put a whimpy fuse holder on a big circuit.