Still trying to iron out 12 volt problems with 94 U225. Replaced monitor with flat screen 7 inch but knew 1 of 3 red wires leaving monitor switch was grounded or shorted as some would say. 1 pink wire feeds the switch and 1 small red wire goes to audit 860 and 1 red wire goes to monitor and 1 red wire heads back toward the fuse box but suspect it goes to tanks or maybe rear camera. I temporarily took that red wire loose and I get no signal from audit with everything else heated up with 12 volts. Has anyone been down this road before and able to shed any light. Seems like even with that one wire disconnected I should get a signal from camera or liquid audit reading unless my audit and camera are shot. For clarity I will say that all 3 red wires were on one connector at monitor on/off switch . Thanks Tommy T. :) tommytstrat@yahoo.com