All, I have a issue 1992 U225 Cummins 5.9 upper cabinet, drivers side fan. The fan is 4 wire, yellow low spd, orange high spd, red medium spd, black is ground. FT connections, yellow, orange and black. I know that I have 13v with ignition on yellow wire with the fan swt in either position. I have no voltage on orange with the fan switch in either selection...