Right,
I guess I should have mentioned right off that I'm not towing anything.
However, I did open up the top of the dash panel and ran wiring from the back of a cigar lighter to a GPS. 5 minute job and everything was fine for hundreds of miles. I really don't think its related?? Even the connections I made were shrink tubed and perfectly soldered. I doubt I 'nudged' anything?
Checked pin 5 of the relay and yes, 13.25V
Pulled Fuse 12.
Backup Lights STILL on.
I've been researching about many reverse lights are switched through ground instead of the hot (something about making sure they fail ON instead of fail OFF, so you know about it).
Maybe the F53 also switches through ground and the lights are finding ground somewhere else through a short?
I usually don't have this much trouble with something like this
Frustrating..