I have attempted every fix I can think of without success. Here's the problem: When I turn right and the coach leans left the gauges all lose power. As soon as the coach completes the turn they resume normal operation. It does not happen when turning left, going straight, climbing or descending hills. I attached another ground and there is no change. Because all this is behind the dash (requiring dash removal to get to the wiring) I cannot get a meter to confirm I am losing +12v. It will not happens when stationary. I placed jacks under the right side of the coach and then dumped the air suspension to get the coach on it's left side. No loss of gauges. I can't move the wheels with the steering wheel on solid ground. Looking for any ideas on what I can do. I am aware I can run a new power wire but I am concerned that a wire is shorting out and could still present more problems if not found and corrected.

Tom, I think if there was a short on the +12VDC line during the right turn, I probably would not come back on immediately after the turn but would stay off until the breaker reset itself. Could there be something in the electrical cabinet that is swinging around and perhaps hitting a relay.

Sounds like you do not have an access panel on top of the instrument panel (above the dash) like I do. If you could get a wire to the gauge power somewhere and put a LED at the end and it would confirm loss of power there or somewhere else as a test fixture?

Do the gauges go off on any right turn? or only on a tight turn where the coach leans hard?