fwhitetail.....Below is the procedure I used to install a more convenient water heater switch inside the coach. The lighted (so you can easily tell when it's turned on) switch I preferred is made by Cooper, and the part number is 277-W, Quiet Switch with Pilot, $6.49 at Ace hardware.
I found access to the junction box on the heater on my unit to be too restrictive, so I did the following:
1) I cut the romex where it passes over the top of the heater.
2) Ran a white wire from the silver screw on the switch to both of the cut romex white wires (one from the circuit breaker and one from the heater, so 3 wires are connected here.)
3) Ran a black wire from the circuit breaker side of the cut romex black wire to the brass screw on the switch.
4) Ran a red wire from the heater side of the cut romex black wire to the black screw on the switch (left side of the switch).
5) Connected all ground wires at the romex cut, and attached it to the ground screw on the switch.
Hope this helps.
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