Not sure what you mean by control box, but on our 2007 Ventana with same electric leveling, the wires plug into a box in the front compartment on the driver's side, up near the top.
I've noticed the control panel seems to need then engine to overcome the start and be putting out sufficient power from the alternator to work. Patience is a virtue this system requires you to obtain.
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07 Newmar VTDP 3330
02 Kaw Vulcan Nomad 1500 on CruiserLift
16 GMC Acadia w/Air Force One & Blue Ox Avail
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