There is a rubber cap on the top of the jack on mine. Take that off and there is a bolt head. My camper came with the "mystery" crank along with the stabilizer crank. The "mystery" one is for that. Either way you can put a socket and wrench to fit in your travel tool box.
But, of course look at the fuse. The fuse for mine is between the battery on the tongue and the camper and lower to the ground.
I just had the same problem yesterday the 27th. as originally stated. My tongue jack will not work off the battery alone although it did. If I plug my 7 prong plug into my truck connection, it works just fine??
Thanks, Mike
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Mike
2014 Jayco Flight 26BH
2015 GMC Sierra SLE V8 4x4
Linear Mode
