Gonna fit a switch to control my fan on my safcos so am i right in saying i switch a positive through a switch ?? and take to positive of fan ? is it a hard/constant negative the fans have anyways , hope u get what im saying lol and wheres best place to fit on a saff dont wanna ruin anything on dash by putting holes in etc ? where do ppl put em on these cars probably going to disconnect rear fog wires and put it throgh that switch alredy on dash that wa with light so i know its on and just need to re-conncet mot time