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Old 11-09-2021, 11:59 AM   #1
CC
 
1972 27' Overlander
Heinsburg , AB
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What is this

https://www.airforums.com/forums/att...1&d=1636484164
After having my '72 overlander for 3 years and going over all of the appliances and propane funtions, I still don't know what this switch is for.
Appreciate your help with this
CC
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Old 11-09-2021, 12:17 PM   #2
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Water pump?
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Old 11-09-2021, 12:18 PM   #3
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Quote:
Water pump?
Nope
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Old 11-09-2021, 12:24 PM   #4
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First, let me say I don't know... BUT I suspect if you haven't found what it does yet, it may be a vestigial artifact from a system that has been upgraded at some point. Have you tried tracing wires yet?
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Old 11-09-2021, 01:19 PM   #5
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1972 27' Overlander
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Quote:
Have you tried tracing wires yet?
I did try looking under the counter, but it got complicated fast. The switch and red light are not on all bathroom counters, but it looks like factory. The water heater is near and I am wondering if I have an electric option...
I have been through my manuals and can't see anything there.
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Old 11-09-2021, 01:29 PM   #6
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What is this

This was for the bathroom fan switch on our 76 Sovereign.
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Old 11-11-2021, 10:52 AM   #7
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1972 27' Overlander
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So, I trecked out in the snow to confirm that this switch isn't related to the bathroom fan. The bathroom fan and switch on the '72 is located to the left when "on the throne". Still hoping someone will tune in and solve this mystery.
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Old 11-22-2021, 04:16 PM   #8
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Tank heaters?
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Old 11-22-2021, 05:19 PM   #9
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Could it be the switch for the Thermasan waste disposal? Page 45 of your owners manual.
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Old 11-22-2021, 07:00 PM   #10
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I'm surprised it's not for the water heater, mine has an on/off switch with a red light to tell you if there's a problem.
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Old 11-23-2021, 08:27 AM   #11
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I did wonder about the thermasan; I understood the controls were in the tow vehicle. Tank heaters; I'll have to see what I can find out about that. This unit has lived it's whole life in Alberta, so that is possible. It is not related to the hotwater heater, dbj216 give me a tutorial on how to tell if I had an electronic water heater, confirmed it's not. The wires on the back of the switch/red light run to the left, under the sink where they cannot be easily traced any further. After so many views of the post and only speculation on what it could be, I have to think that this is NOT a switch/component from the factory. The investigation will have to continue in spring as we have a foot of snow and chilly temps. Thanks for all of your input and if someone has an "ah ha" I'd sure be interested to hear more.
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Old 11-23-2021, 09:53 AM   #12
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You can get a wire tracer from maybe Lowes. It sends a signal down the wire and the unit can detect where the signal is. It may help track it through the walls.
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Old 11-23-2021, 05:28 PM   #13
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Only if you have direct access to the wiring you are trying to trace at some point. The aluminum interior shields out the signal quite well otherwise.
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Old 11-23-2021, 07:01 PM   #14
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Well, a 72 Overlander had a manual pilot light on the water heater. I wonder if someone through the years installed a modern water heater with electronic ignition. A typical water heater switch is a toggle to on, and a red light that indicates no ignition. A red light means water is not getting hot.

Take a look at your water heater and verify if it is a manual lighting of the pilot light, or is it a electronic ignition. Modern water heaters have 4 wires coming out of the top of them (inside). Two wires are for the 12v + and -. And two wires are for the interior switch. Maybe you can see with wires out of the water heater and then maybe feel where they may go.

If your water heater is original, then I'm all wrong on this hypothesis.

David
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Old 11-23-2021, 09:07 PM   #15
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Originally Posted by rmkrum View Post
Only if you have direct access to the wiring you are trying to trace at some point. The aluminum interior shields out the signal quite well otherwise.
I was thinking more of the interior areas like the cabinetry. If it's behind aluminum then obviously it wouldn't work. From the description in the owners manual and considering the button and light is in the bathroom, it sounds like the Thermasan device to me. I think pretty much everything else has been ruled out. But who knows. Some PO modification could be just about anything.
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Old 11-24-2021, 08:42 AM   #16
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Quote:
Take a look at your water heater and verify if it is a manual lighting of the pilot light, or is it a electronic ignition.
Thanks for posting this David, it was new information to me and could help others as well.
I did check and confirmed it is not electronic (see post #11)
A wire tracer could help to see just what part of the trailer the function is in. It's got to be water/waste related.
Does anyone use the thermasan these days?
CC
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Old 11-25-2021, 06:36 PM   #17
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Woops. I forgot you had already confirmed you have the old style water heater. So now I'm at a loss.

You'll get it identified eventually.

David
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