Wiring Help!

OK I'm installing my hella lights today and i was wondering if I should mount the relay outside my cab or inside? Also I am wondering how can I run wires into my truck from the engine compartment without drilling holes into my cab.

 

Mount the relay under the hood then you don't have to run higher current into the cab. You only need to run one wire threw the cab. Just the relay coil negative. You can grab the relay positive from I'd take it from the existing high beam on the drivers side. It's a pink wire.

To the switch with that coil negative from the switch to ground. You should have room to sneak one small wire threw the firewall by the existing wires.

If you don't want to go into the fuse box under the hood get power directly from the positive battery terminal and fuse the new circuit. Things depend on it though that you never said. Like what kind of switch. One wire would be just a two terminal switch. If it's got a indicator then you need two wires. A positive from the positive side of the coil and a negative form the negative side.

Depending on the light current you may have to run the high current part 12 gauge or even bigger wires. Depends what you have . You didn't say.

 

Check where the main harness goes through on the drivers side. You can put your finger in there and fish some wires there. I went next to the harness and pull a small hole in the grommet and fed the wires through. The will come out above the brake pedal.