HOW TO WIRE IT:red to + output(battery +)green to ground ie - (Minus)the other 2 wires, yellow and pink, AC input, connect to magneto coilSpecifications:Color: Black/SilverVoltage: Fit 12V Battery and Bulb, LightAC Input Voltage: 20-60VUnloading Output Voltage(Idling): 12.5~13v±0.5vCharging Output Current: 0 - 4AWith Battery Charging Voltage: 14~14.5±0.5VWorking Temperature: -20°to 60°Cable Length: 13cmSize: 5.8x6.3x2.5cmQuantity: 1 PcNote:1.We provide clear pictures, measurements where possible. Please check as much as possible to make sure the item is the one that you need.2.Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm)3.The color of the actual items may slightly different from the listing images due to different computer screen, thanks for your understanding.4.No Instructions Included.Professional Installation Is Highly Recommended!Package Contents:1 x Rectifier