I bought my rig (1999 36' Pace Arrow Vision) used and from the day I had it there were issues; the left turn signal and the back-up light are come how shorted together - that is, the under-dash relay fo both circuits activates when either one is switched on. The back-up TV flashes on and off with the turn signal and the turn signal comes on when I shift into reverse. I've chased wires until I'm nuts and can't find anything. Anyone else had this problem? Is there some common pinch-point that I'm over looking? I figure that it has to be somewhere up front because it activates the relays as opposed to a crossed connection at the lights themselves

Help!