can't find the fuse

yep!

I have a '99 Four Winds Hurricane with a fuse panel under the dash on the drivers side mounted to the firewall. Check there?

I understand that all of these appliances are controlled on different circuts. I hought perhaps there might be some kind of "main" controling several circuts. I had been troubleshooting the over temp link in the ater heater ignition as sugested by bypassing it. the burner came on for an instant and shut down. since then, I have not been able to find current in those appliances.
Yes I did check the black box battery control box and there is no interuption on the gcfi circut. (but thanks for thinging of those possibilities I might have missed)

Is there a GFI that has tripped and needs to be reset?

Just a thought. Did you check the fuses in the "Black Box"? That would be the Battery Control Center. Should be located under the hood on the drivers side.

How did you check the fuses?

Did you just look at them or did you test them...verify with a meter that 12V DC power was on both sides of fuse??

The 'fuses' for WH, Furnaces and water pump should be individual ones (vs just one fuse) and those should be in the converter compartment (powered by converter when connected to 110V AC source and battery source when not connected).