Quote Originally Posted by Doc Banger View Post

RedDawn, thanks for the illustration. I'm not going to add a seperate switch or a...
The "trigger" is the reverse lamps. When the reverse lamps come on that will activate the relay coil which closes, connecting pin #30 to pin #87. You can put LED's in there, it would be simple and they are fairly bright and you wouldn't need any wiring modifications but if you're talking about adding some kind of halogen driving light you will need a relay or the smell of melted wiring is in your future.