Landing Gear Problem

Must be a bad connection somewhere if it works with the truck plugged in but no other way.

If you have a electrical tested trace the wires and see where the power stops. You could have a bad wire or bad or loose connection.

Every one is right when they say the landing gear runs off your battery. I would check you inverter (shore power charger). Could be it's not working and allowing your battery to drain. If it is working properly you should have plenty of juice to operate the landing gear, even with a weak battery.

Found the problem, finally. There was a fuse hidden behind the battery box, well wrapped with tape. Replaced that and all is well.

Glad to hear it was an easy fix.