I have tried to search this with no luck. I just bought a set of rock lights and want to add a new circuit to the aac side of the ignition. Can i just use the "spare fuse location of the fuse box in the cabin? How about a spare fuse location in the fuse box in the engine bay?. And, how to you add a wire to these locations?.. Thank you for your ideas. I do not want to just add it to the bat terminal.