I'm trying to make sure I understand the conditions of your hot water heater problem.
I don't have a coach AC power wiring diagram. I can't find the wiring diagram for the Suburban gas/electric water heater, so I'm flying blind.
Did I understand that if you are on generator power, your water heater switch red-light glows & the water heats?
If you are on any outside source of AC power, the red-light does not glow & the water does not heat?
???
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