what are you trying to do? run your fan all the time or add a second one? it doesnt do any good to run your fan while the bike is in motion, counter productive actually...get out a volt meter and read the 2 pins, if you get 12 volts all the time, then the ground is what is switched on and off...if not then the positive is whats switched on and off....you may be able to get a sensor that turns the fan on at a lower temperature, ask one of the sponsors like schnitz raching as Im not sure on that...there is a manual here for everyone to download it like 500+ pages...you can look in there for wich color wire does wich thing