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I did this some time ago, but not with a 12 volt inline thermocouple like the one installed on the cooling fins of a Dometic fridge.? Instead, SilenX offers an integral thermocouple in their EFX-12-15T fan (note the “T” at the end of the model number).? The thermocouple is mounted in the same cooling fin location as the Dometic thermocouple, and the Dometic thermocouple is bridged out.? The integral thermocouple works far more smoothly, because it ramps up the fan speed as temperature increases, instead of just a binary on/off reaction.

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Dave

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Another thing some do is put a thermocouple on the power wire.?