[Russell Ashley]

My original wires went through the windshield post and over the drivers side top and then over to the light. Originally the light had power to it all of the time and the light switch just provided a ground when you turned it on. To do what you want to do I would get rid of the original wires, and just ground one side of the light to the cab. Then run a wire from the switch you will be using out through the firewall and down under the cab and up into the cab through the rubber grommet where the gas sending unit wires come through the floor. It's easy to then fish it up to the light. You could also just run the wire under the carpet instead of routing it out through the firewall.