The power jacks on the TT's have no smarts... if you extend them all the way in either direction it will blow the fuse. You need to mark the shaft to let you know how much more you can go either way. Once you hear that funny noise like it is binding, take your finger off the switch as fast as possible.
Use spacer blocks under it and watch how high you raise it and it should be OK. I also ran the power jacks 30 amp fused lead directly to the battery which does not have any additional draw from the TT's internal load. You may want to look at a slow-blow fuse for the power jacks inline fuse.
1 - Make sure that the wires are connected nice an tight for power.
2 - Make sure that you have the TT's wheel chocks in place before raising/lowering using the jack, as any shift will add stress on the jack.
Since wiring it directly to the battery, I have not blown a fuse since.
Just my thoughts
2013 Jayco Eagle 284BHS
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