1Fitment: Voltage regulator rectifier is replacement for TRX300 Fourtrax 1988?1992, replacement for TRX300FW Fourtrax 1988?1992. 2OEM Number: Rectifier regulator replace part number is 31600 Hc4 010. Please double check the OEM part number of your item before ordering. 3Function: This rectifier turns alternating current (Ac) into direct current (Dc), which is filtered and supplied to the load, or to the inverter. It can also provide charging voltage to the battery. 4Excellent Performance: The rectifier is made of metal with high hardness, professional manufacturing, exquisite workmanship, high accuracy, stable performance and high reliability. 5Ideal Replacement: According to the original size design, perfect replacement of the old or damaged original one, no need to modify, easy and fast installation.