Originally Posted by bubbles
The OP's issue is that the on button will not illuminate (system won't turn on). I think the ignition switch on provides 12Vdc to the leveling system controller via one of the fuses in the battery control center box. That 12Vdc sets the logic for the system to turn on. The leveling system control panel is interconnected with the controller by data bus cable. I think.
Nope, I'm wrong. The BCC does not have the fuse for the controller/ control panel. Disconnecting the large connector at the hydraulic reservoir did not allow the system to power up (on button did not illuminate). That connectors harness does go to the controller. I don't know from where that 12Vdc power originates. Most likely from the coach batteries but don't know where and don't know if there is a fuse inline.