After working with the Hitman at his Maine RV dealership, I have learned that the slickest way to hook up a toad is to run new wires to new lights on the toad-tail, bypassing all the stuff on the car. Put in new bulbs in the fixtures. That way, no diodes or screwing around with the existing electrical system of the toad. If anyone has any questions about it, you can call Frank at Moon's RV at 207-832-4444. Just tell him you are a friend of Mango Mike and Jerry Winchester and he'll get out from underneath a rotting slide he is working on and help you out. The Hitman is a Master Refrigeration Tech and an Master RVIA tech.
He actually works for a living. Ewwww.