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use the power wire to the std overtemp thermo fan as a signal wire to another relay to run your thermos. but i very much doubt you could modify the switch position in any way.

perhaps the powerFCs laptop software has an option, but i havent looked at it.

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Yes, all of us silly buggers with thermo fans have been down this route.

Tridon TFS141 is the most used switch, 85 on, 80 off.

I think it's too hot for a bottom tank install, but the Tridon range is a bit limited in the M16 x 1.5 size.

Champion also make identical switches, available from REPCO.

Haven't seen an option for controlling the thermo fan via Datalogit.

Engine driven fans FTW.

Edited by grigor
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