Why does my engine fan turn on when there is no voltage?
Why does my engine fan turn on when there is no voltage? If there is no voltage, and you hear no click, the Cooling Fan switch (10) is stuck in the off position. If there IS voltage but you do not feel a strong click (but there is a weak click) then the relay contacts are welded together by arc-current. How do you wire a fan to a battery? Take the second jumper wire and connect one end of the jumper wire to the positive wire from the fan. Extend the other end of the jumper wire over to the...