on the 6066 seires trucks, you have to drill a hole for each light big enough to use a fishing wire (straightened hanger works good) to fish the wire from one light to the other, but the hole has to be small enough for the base of the light to cover it. then you have to fish a wire from one of the corner lights to the back of the cab were the double wall ends. I have done this one a lot of these trucks.
