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Try using a meter or test light and check for power after the little CB next to the battery that the cable is connected, there should be a reset on it to reset. If there is power on both terminals its ok. Also make sure your batteries are ok, they may be dead.
If you have no power after checking the switch in the jack switch panel, the CB, the batteries, then maybe the converter has failed. This does happen. That would explain if the batteries went dead, and or you have no 12V when on shore power. The converter is located inside the basement rear area behind the sliding panels near the center of the trailer. It plugs into an outlet in there. You can also test it for power output at the 12V side terminals.
One more item is to check the fuses in the 12V fuse panel. Maybe there is a main fuse in there, not sure. I think there are just fuses for different users.
On second thought, if the jacks and slides are working, then the batteries and most likely the converter may be ok. The Hyd pump is wired direct to the battery. I would look at that CB by the battery real good, even just bypass it to test it. Also, that switch in the jack panel could be corroded and failed internally. Get access to it and bypass it to test.
Good luck!
Bill
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