We say "Waterproof Cooling Fan" His internal structure consisting of two coil sets, one of which is winding, a winding run, these two windings are connected in series, thus forming a three-point, the series points common , start winding end terminal to run to start winding end terminal to run, "Waterproof Cooling Fan" also requires a starting capacitor, a capacity of typically between 1-2uf, pressure typically 250v, which refers to the normal mains AC motor used This capacitor is a polyester capacitors, no positive and negative points, there are two connectors, one end connected to the end of the winding start, one end connected to the end of the run winding to form triangle, "Waterproof Cooling Fan" power to run one after the end of the winding, Another pick a common ground wire to connect the motor housing;