[Chester Stone]

I have stumbled onto something that does not look correct and may be the problem or at least one problem.  I have worked today to prepare two schematics in color.  One is the wiring for the front A/C which seems to work perfectly.  I used the wiring directions supplied by Newell when I replaced both thermostats a few years ago.  The other attached picture is the schematic for the rear A/C which shows a small but perhaps significant difference.  On the front schematic picture, note that pin #4 on the control panel is blue, which is 12 volt negative ground.  On the rear schematic picture, pin #4 is a white wire.  Every control panel schematic that I have found shows this pin as blue.  At the rear thermostat location where the thermostat wires connect to the coach bundle of wires, there are several wires that are not used, are cut short and white is one of them.   I reason that the rear A/C has not operated properly with two compressors since it left the factory.  I will try to verify that the short, cut white wire at the thermostat is the same one attached to pin 4.  If so, I will connect it to the blue thermostat wire group.  Thoughts please.