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Motorola GR300 Id-o-matic fan relay

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Jun 4, 2012

Can anyone recommend a simple fan relay kit for the ID-O-Matic 3 repeater controller? I'm wondering if it's something that could be easily built from scratch? I'm in the uk so ideally something that could be shipped to me.


Mar 30, 2005
So Cali
Fan Relay? NOT part of the ID-O-Matic.
We use a thermostat mounted to the transmitter heatsink to control the fan. Something that closes on temperature rise above 100 degrees F. switching on the fan.

Sensata Airpax 6700

6600 & 6700 Series Thermostat

The GR300 is supposed to have a four wire fan that has a thermistor mounted to the transmitter's heatsink, this is a variable speed fan.
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