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wow. talk about an interesting way to run a fan.
so my guess is the magic black box measures the resistance of the coil as a function of temperature.
The hotter it gets, the more amperage it sends to the fan (like you said).
The "problem" is there is no "On" or "Off" state for the fan. The fan is variable as a function of temperature.
You COULD put an amperage gauge in series with the fan motor. Or you could put a temperature gauge next to where the relay gizmo is located - the temperature shouldn't really change that much.
Or, you could just put a temperature gauge on the engine to make sure the engine doesn't get too hot.
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