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Hello I will help you with your question,
If this is a race car you are running the fan (radiator fan??) full time?
You are turning the relay on with the master switch so the fan runs?
Let me know what your setup is and I can help you with a solution
Yes I agree, A little more info would be helpful here so somebody can help figure out what would be causing your unwanted voltage and we can get to the bottom of a solution. Do you possibly have installation instructions for the fan and the part number and manufacturer for the fan?
Still not quite able to picture how this circuit is set up but I'll hazard a suggestion. Perhaps you could install a Diode inline between the fan and its power source?