Is there a battery disconnect switch for a solenoid? If not there should be a master fuse or circuit breaker up close to the battery on the tongue. The slides and jacks come direct from the battery with separate current limit devices. Usually these are self resetting.
Rethinking you orig. If the converter will supply all loads in the fuse panel, this would be simiar to dead batteries. Since bigger loads still work direct from the battery, it must be good. Only thing left is the cable feeding the fuse panel and all "hotel" 12volt loads must be open. Believe all battery powered centers begin with a large fuse or man/auto breaker close to the source-battery. Maybe located on the "wall" close to the batteries or on protected structure very close by. Got a meter? Connect the black side to frame or ground and use the red starting at + on battery and check every terminal on the red cable leading to panel.
There may be an in-line fuse off the battery. There are likely multiple wires connected to the battery (or branched off somewhere). The supplies for the slide and landing gear are obviously fine, but there may be another wire supplying the the rest of the 12V system - the inline fuse on this one may be blown.
I will unplug tomorrow and check the all the connections and incoming terminals, but no fuses are blown on the main feed. It's a fifth wheel, so the battery is inside the front compartment and no bypass switch.
Ok,, soI measure voltage and get nothing at the fuse box. The battery has a great charge. The solenoid shows no loss, but after that...the cable goes up into the trailer and becomes impossible to trace.
Does anyone know where a disconnect or fuse could be in this model?
Dealer found the issue. There is a circuit breaker (thats what they call it) inside the 5th wheel hitch on the solenoid there....impossible to see unless you know what you are looking for. Tiny little black button resets. I looked for hours and never would have found it.
If you ever have this issue, this is a possible solution.
Thank you for all your posts in response.
Picture of this is attached! Picture is rotated to see the button simpler. This would be directly overhead looking at the bottom of the two nubs.