Originally Posted by Highway 4x4
If you plug into 120V and it still goes down then it's sounds like the converter isn't converting. If it was, the lights would be back up to bright. Check all the fuses and the hidden thermal breakers.
I will second that
A hidden thermal breaker....
Hidden...Means it is hard to find,,See "Joke" (Or is it) below
Thermal: Heat operated
Breaker: Circuit interrupter (Resettable Fuse)
These come in two flavors..Automatic Reset (On some time alone resets,,Others you need to open the circuit to stop current flow and THEN time resets)
Manual: Push a button to reset
Mine is Automatic time alone 80 amp
I think that back at the factories (Both the chassis factory and the body builder) They have a contest to see how well they can hide stuff like circuit breakers,,,Fuses,,,GFCI's and Switches.
Among other things.