Result: surface mount reverse light

, the factory roof, or any non metal surface will not provide a sufficient grounding surface for the lights | I want to put lights on my cab of a1985 custom Deluxe how do I do it.It has two...

. The purple wire is typically connected to the reverse light circuit for the reverse lights on the trailer | I have a 1985 4runner that I need to wire up a brake controller...

to scrape the trailer ground location before I installed it. The VW ground is on a painted metal surface | I recently wired in a trailer vw converter and 4 wire harness to my 1985 VW vanagon westfalia to haul a very small trailer....