Thanks for the good info. I did forget about the parking brake activating certain items such as the door air lock.
I guess they had a plausible reason for tying them to the parking brake, but the headlights work without the parking brake. I guess you would not want to drive in the fog with your parking brake on. LOL
I enjoy this forum a lot. I read it almost daily and it has answered a lot of questions and help me know more about my coach.