sceamig help for my 2000 rexall airbus

so sorry to everyone who replied and thank you for replying. I did a very poor job in posting my last post. I started with my water heater then jumped off track. I did finally call an R.V. mechanic for the house side of my R.V and after I had changed everything having to do with the heater it turned out to be a corroded wire from the darn propane tank safety valve. Now, the rest of the story. When I began working on the w/h my r.v. would run. Its a 2000 Rexall Airbus with the V-10 Ford engine. Gas type. 36 footer. But for some reason, now it won't start. So I naturally figured that I may have shorted something, fuse, relay, or made a horrible mistake. As it turns out the chassis side is totally different from the house side so it is improbable that my fear most likely is not the cause. Sooooo, I would still appreciate any help or suggestions that any of you may have. Again I am very sorry for my bad attempt to post. I did realize that I gave little info on my r.v. but I didn't know how to go back to my post and correct it. Thanks again