Dometic rm2820 fuse issue

I have a Dometic rm2820, and for some reason it keeps blowing the 3 amp fuse. I could use any help in figuring out why? I've tried to find a wiring diagram so I could trace it out and see if a wire is shorted out that would cause it, but haven't had a lot of luck finding a diagram for this model. Any help would be greatly appreciated, since this is my home now for the foreseeable future.