I agree. Defiantly use a relay; DC fans pull a lot of current. Your switch may be OK but if your wire is to small it may burn up and start a fire. Relays are easy to use and you can find them at almost any Part Stores(Look for a general use, 12VDC, 30AMP). Let me know if you need help on how to hook one up.e-man said:I suspect the Taurus fan had a relay on it when you removed it. If not, get a relay and don't worry about it. If you insist on having a manual switch that is. Seems to me you would want to rig up a thermostat to turn the fan on and off.