water heater problems

[TC Campbell]

I have a 99 Jayco fith wheel 3610 and just had a new water heater installed gas works great electric does not work at all does anyone have a schematic of the wiring ? i know it works on 12 volt and 110 can anyone tell me witch will go to the 110 switch the water heater is a dometic and the on off 110 swith is under the sink what a nightmare thanks for your input there is no power to the 110 switch

[Route 66 Traveler]

Have you looked closely for an on/off switch on the water heater itself? When I was looking at new RV’s I saw two that had that switch on the water heater and not inside.

My water heater has a yellow wire that goes to a relay that energizes when I turn on the switch inside the RV and that relay supplies 110v to the heating element.