Keith,
Was the controller in a bigger box? The new one is certainly not waterproof so being in the open like that wouldn't be good I wouldn't imagine. I do know there is a large junction box where you describe.
Tom, the fuse was on one of the silver boxes on the wall that separates the waste water tanks from the rest of the basement. There are a few there, but only that one or maybe another had a fuse on it. I can look on Tuesday. I'll be using the coach for the next couple of weeks beginning then so I can take a picture. It's been over a year since that fix, but I believe I can locate the box.
Mike