A friend of mine gave me an electric tongue jack after he decided not to use it on his Airstream, he bought a new one instead. I would like to use it.
I checked it out and it appears to be fine, although I haven't mounted it on my camper. It is rated for 3500 lbs. It has a 10 gauge wire and a 30A fuse. Testing it, the motor draws a lot of current at startup, then it settles down to something reasonable, 5A or so while running, I'd expect it to use more under load jacking up the camper. I looked in my manual and the directions recommended hooking an electric jack to the brake safety switch which is a 12 gauge wire. My reprinted manual doesn't show the wiring for the safety break away switch, so at the moment I have no idea where it connects to 12V
I am thinking it might be better to run a new wire, either from the fuse block at the rear or connect it to the big charging wire at the front where it ties into the vehicle wiring. Neither appear to be easy to do unless I run it on the outside next to the gas line.
I don't recall seeing the brake wires when I had the front belly pan off.
I keep questioning why it takes so much power to move 600lbs of tongue weight.