hello, hope someone has a suggestion for this problem. We have a Thor ACE 30.1. If the MH is plugged in the outside camera views show up, including the rear when backing up, side views when we turn on the turn signals. As soon as we unplug the electric the radio won't work at all, so there are no camera views when just the engine is running. Hope that explains it... Any suggestions of what to check? We are supposed to take possession tomorrow and discovered the problem today. Greatly appreciate any ideas, thanks!!