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Old 02-28-2018, 07:15 PM   #1
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1960 24' Tradewind
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Dometic M50 Thermocouple

On the road and the thermocouple on this M50 has failed. For those of you who did not give up on your M50, how have you handled replacing it with current off the shelf TCs?

This is a very good working and in good condition old fridge in my 60 Tradewind. I would like to figure this out. Al the threads I can find are old and just say replace it. I would prefer not.

Thanks! Richard
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Old 03-02-2018, 10:36 AM   #2
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send me a pic . I am looking for a click fast for a 76 in a 62 tradewind .
have it working with an electric element clamped to clickfast post and t-stat install inside ( out of rm 7030 ) customer would dearly love too get gas going again but won't mcgyver lpg ! have several old thermocouples so maybe . got a working clickfast ?
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Old 03-03-2018, 03:08 PM   #3
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Here is the thermocouple from the backside and the other end as it screws into the gas flow control. The threads, type & size of the opening is unknown and will hv to wait till I hv my full tool set at home but by the looks of it there are options for adaptations. I do not know if this is the stock thermocouple but the control valve looks original. Thanks for your help.
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Old 03-03-2018, 05:42 PM   #4
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1962 26' Overlander
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Good luck finding a thermocouple. I have an M50 in my 62 overlander, and converted it to 12v using a danfoss compressor, evaporator kit. It works great and I get to keep that beautiful vintage look.
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Old 03-03-2018, 05:47 PM   #5
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Can you tell me more abt your conversion? Tnx
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Old 03-03-2018, 06:06 PM   #6
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http://www.suremarineservice.com/ice-box-conversion-components.aspx

See link above for the kit I used, using a flat evaporator. The compressor fits under the fridge, install through the opening vent door. You will need to drill a 1Ē diameter hole to provide access for the cooling lines and thermostat wires.

Itís really pretty easy.

Iím out of town right now, I can send some photos in a week or so.
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Old 03-03-2018, 07:30 PM   #7
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Sure like propane and do not carry enough battery to source the current needed for that dc conversion.
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Old 03-03-2018, 07:35 PM   #8
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Dometic M50 Thermocouple

I have not dissected the existing thermocouple but since itís not electrical it must be creating mechanical movement at the actuator end which controls gas flow. Is this right?
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Old 03-04-2018, 07:10 AM   #9
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The thermocouple is an electrical device. It generates 20 milivolts which is needed to open the gas valve.
If the tube/piping is not compromised you may be able to disconnect it from the gas valve and clean the contact points. Both at the thermocouple tube end and inside the gas valve.
Be sure to push it in the gas valve when reinstalling. Do not over tighten it.
The flame end may need cleaning as well.
Be sure the flame end is located in the flame.
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Old 03-04-2018, 04:54 PM   #10
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TG Twinkie this is good to know. Iím hopeful, when I get home in a few weeks I can disassemble the gas flow control and interface an off the shelf TC to it. Seems there are numerous TCs with a couple of wires coming off them.
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Old 03-04-2018, 05:01 PM   #11
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Send me a pic of the back of the unit. There won't be any wires on the thermocouple. It will just be a small copper tube.
This type of thermocouple is used on household gas water heaters and are available at well stocked hardware stores.
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Old 03-04-2018, 05:04 PM   #12
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I posted a pic of the back of the valve earlier in this thread.
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Old 03-04-2018, 05:10 PM   #13
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Forgot you posted pics. In the top pic I can see flame so you have gas.
Are you travelling with the coach?
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Old 03-04-2018, 05:13 PM   #14
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Yes to traveling with it and I hv the light button jammed to keep it lit. Iím the control for the interim.
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