Wtf did I damage now?

[wannabejeep]

when I tried to wire my first set of lights with the help of some friends, I got smoke and sparks, unfortunately mine came from the mess of wires and fuses under the hood. Well my asshole friend wired the power straight to the ground somehow and burned up a wire. I didn't think we'd ever find it, but eventually we did.

[Trailer Ray]

wiring lights is easy. power to switch. ground to switch. switch to lights. a few holes here and there and youre good.

[jeep00xj]

how did it burn up the wire if he wired the power straight to the ground. where was the ground?

[wannabejeep]

i don't know, all I know is that the power wire went straight to one of the bolts on the bumper for the winch and it was on the factory switch so it burned up some shit.