I have the same set-up in my '04 American Tradition. A couple of the circuits are overloaded and the Molex connectors fry before the fuse blows. I recommend replacing some of the lights with LEDs to reduce the amps. The cargo bay lights is a common failure point, and so are the interior circuits with all those halogen bulbs. I get mine from one of our sponsors, RVledbulbs.com (see discount offer), but there are many sources available.
If the board itself has a problem, you can send it back to the manufacturer, American Technology Components, for repairs. If you need the wire end of the Molex, tell them and they will send that back with the repaired board. Or you could just wire in a bypass for the Molex connector - I did that "temp fix" for a couple years. If it's just the wire end connector that is bad, you could buy the connector and do it yourself, or find a buddy or local shop that has the skills. Molex connectors are pretty common in electronics.
http://www.atcomp.com/
