Originally Posted by MtnDAWG
I turned the battery disconnect to the camper and jacked works without being plugged into the truck.
Need to point out something else since you are talking about the battery disconnect. You use this disconnect only when storing the RV. It always needs to be ON when pulling it or using the RV.
The reason you have it ON when pulling it, is for the breakaway switch. If the RV does break away from the truck, then the electric brakes on the trailer have to get power from the RV's onboard battery to stop the trailer when it becomes disconnected from the truck and the emergency breakaway cable is pulled out from the breakaway switch.
The brakes cannot get power in this potentially catastrophic situation should the battery disconnect be OFF.
This thread may help:
Side note: Some RV's may be wired so the disconnect does not affect the breakaway switch.