Originally Posted by Randal
I do have the polar pack heaters but surely they would put an indicator light on it and label the switch. I assumed the switches for the heaters on the holding tank were under the master bed. I will check that out tomorrow.
Don't assume they would label the switch. The switches on my control panel are labeled BUT the lighted tank heater switch above the panel is not labeled nor are the 2 12 volt light switches under it nor is the single large flat 110 switch under it (operates the ceiling fan). It has been my experience that 12v switches are smaller and protrude and 110 switches are house sized and flat. I'd look for something on the 110 side - meaning it would only have any effect if you're on shore power or a generator.
BTW, I only have 1 switch which operates ALL tank heaters simultaneously.
Sent (I think)