In the various Tiffin motorhome online communities to which I belong, there are two questions that get asked pretty much weekly.

The first is: what is this unmarked red switch to the left of the driver seat?

Obviously it is the self destruct button. Or is it the passenger ejection seat switch?

No, seriously, the answer is that it is the switch for the mirror heaters. The side mirrors of the coach are heated, to clear them in cold weather. Something that we’ve never needed, since we try to stick with warm weather as much as possible.

Here’s a peek at the heater, from when I replaced the mirror glass on the driver-side mirror:

The second most frequently asked question is: what is this little thing on the ceiling?

Is it a microphone to spy on you?

No, the answer is: it is a temperature sensor for a thermostat. There are three of them inside the coach, which are each connected to a thermostat. That enables the thermostats to be positioned inside cupboards or on walls, but still sense the temperature in their respective regions.

The wet bay also has a sensor, but it is a bit different — a copper probe connected to the temperature dial, used to control the heating of the wet bay (frozen pipes would be bad):

Hopefully this helps some people who had wondered about those.