Chiming in, I just installed a battery disconnect switch. After testing I found that the electric jack was inop as well as it's associated led light. I discovered that the BLACK wire (which IS positive) that runs from the jack - Junction box behind battery boxes - Battery had broken. The wire is located inside of some convoluted black tubing mounted to the hitch frame. I had 12v going to the broken end of wire to junction box/battery so I took apart the electric jack cover (easy job) and ran a jumper wire from the battery to the Electric Jack...Viola!. Instead of running new wire, I just pulled the black wire from the jack and rewired directly to the battery as I had a circuit breaker inside already.
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