hi im new here can some one help me im putting a computer fan on a motorcycle to help cool my oil tank in heavey traffic i know it will work hooked up to the battery when the engine is not running because its a 12 volt fan on a 12 volt battery my question is when the engine is running it will be charging about 14 volts will the fan work or will i have to put some kind of resistor between the battery and fan to keep it at 12 volts to the fan