You should be able to reach the power connector in the arm closest to the front of the rig using a ladder. If you pull the wires, there should be enough slack to allow you to unplug it. Then using a vom on the connector going into the rv, check for 12 vdc when the switch inside is operated by someone. No voltage present means the fuse is blown...red led under one of the fuses will light when switch is toggled. Voltage present...motor is gone to the grave. That simple...but the double check you should do first if you find 12vdc at connector when switch is operated is to supply 12vdc from a battery to the motor side of the connector to make sure you don't have a weird wiring problem going on at the switch. I saw that happen on a motor home where the 12vdc wire going to the switch was from a corroded connection and would read as there on a vom, but would collapse under load.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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