Can't get my electric jacks to work!

When I went to extend my jacks to load my 2005 Lance 1121 camper, all jacks were dead. What seems to be happening is that the system is not arming. By arming, I mean when I pressed the momentary switch near the floor by the door, the switch did not light up as it normally does.

More information: The camper battery is dead, so I was jumping it with my Jeep's battery. The slide-out worked fine with that arrangement, but the jacks (arming switch) still didn't. I looked at the breakers and fuses that I know of but didn't see anything that said "jacks."

Is there a breaker or fuse for the jacking system that isn't in the breaker/fuse box with all the others? Is there a solenoid somewhere that might be malfunctioning? Replacing the battery wouldn't hurt, of course, but would it make a difference, considering that I had the Jeep powering the camper anyway?

Of course, I can crank by hand, so I'm not completely dead in the water, but that's a full day's hot and sweaty work!

Any hints that you kind souls can come up with would be greatly appreciated.

Peter