Without the picture, it's hard to be sure, but given the year and model of your RV, it sounds like it may be the electric switch for the water heater. Turn it on, the switch light is on, and you have electric heating for the water heater. I think.
__________________
Ed and Sharon
2010 Wildcat 28RKBS
2019 Ford F-250 XLT - AWESOME Truck!
Retired AF MSgt
I thought I was wrong once, but I was wrong!
|