I'd need a lot more info on that orange knob.. Really can't imagine unless it's a battery cut off someone put in after market.
As for the isle lights... Look for a switch labeled Isle lights.. I have 2 or 3 of them in my rig, one is in the dash cluster, one is in the bedrrom's cluster (Damon Intruder 377) if there is a 3rd it would be in the master cluster but I don't think one is there.