no running lights, no brake light etc. etc

We really need advice here. First off, had trouble with one brake light. Fixed that. Went camping but alas same brake light stopped working but everything else seemed fine. Had some trouble with our elec. tongue jack. My husband bought a new plug, rewired it. Now it works. Somewhere in that time, something happened. We do not know what. Now we have no running lights, no left rear light at all, brake or tail or backup. And the 2 very front interior lights won't work. It addition the TV while checking with volt meter shows most of the points are not working. We have no clue what to do next. Checked the fuses in the TV. All fine. So where to now. The repair shop? To sum it up, not running lights, no left brake, tail or backup, and tv shows only negative, positive and electric brakes working. So all we have is a right brake light on TM. Help?