Troubleshooting the Manual Switches for the Ground Control TT Tongue Jack  

Mine was plug and play and worked fine. Try checking the small plug coming from the trailer for corrosion. There may also be an in-line fuse you need to check.

Mine worked just fine with shore power or on my dual 6volt batteries and or generator. I will assume the switches are faulty. It’s a great product and plug n play. Maybe you got a bad one. I also turned the main head unit so I can pull my tailgate down. Slick trick.

On my previous Ground Control tongue jack, when I went to pick up the trailer from an RV repair facility, the tongue jack wouldn't work with the buttons. I suspected a weak battery, so I plugged in the trailer cord to my truck. Still wouldn't work. The facility had replaced the floor in one of the slide rooms, and didn't have the trailer plugged in, so all the operations of the slide that they did depleted the battery charge. One of the RV techs came out to help me. He reset the Ground Control system from the control panel. Then it worked. I told him that if it was a dead or low battery causing the problem, it seemed to me that plugging the trailer cord into the truck (which was running) would have cleared the problem. He said, "No, the electronic brain on the control panel remembers the dead or low battery, and will not allow the jack buttons to work until the system is reset and it detects proper voltage." I doubt that this is your problem, as you stated that the jack works when activated by the system's computer. If that is true, then the electronic brain is detecting proper voltage to operate the jack. Wouldn't hurt to reset the system, though, if nothing else works.