Let me know what they tell you. Unfortunately something like that is very difficult to troubleshoot over message boards when there are several changes made to the original design. We have NO way to know what the added systems hooked into or what the draw is.
We'd be happy to troubleshoot it all of it. Chassis, coach and 3rd party install, but we would need it here at the plant.
PLEASE do not send questions via Private Message, my inbox fills up too quickly. Post questions in the forum as a new thread so that other users can benefit from the answers. Use Private Messages for sensitive information only (VIN, Contact info or things you do not want the public to see).