Originally Posted by workinrvers
the switch on my 02 Journey is in that location and looks just like a wall light switch. Mine has two in that location, one is for the engine heater (top one) and the other is the 110v water heater. This is behind the door above the washer/dryer cabinet across from the shower.
This is the same as my Journey 02. I would say a reasonable test is to use the shower for a longer than normal time and see if the propane heater kicks on while you are plugged into shore power. If you are on 30A the amps panel sholud indicate. However, if it does not go to Harbor Freight and buy one of those clip on amperage monitors ans see what happens if you use the shower.