Heavy duty solid state combined regulator/rectifier unit that replaces the Yamaha OEM regulator AND rectifier on models with seperate mechanical voltage regulator and rectifier (points ignition bikes). Power handling is superior, and the part is designed to be a plug in replacement. We have incorporated a heatsink design that gets rid of internal heat to the housing quickly and efficiently, making for a very reliable unit. This can be used with your stock harness or our chopper wiring harness. No need to modify your harness or unground brushes in your stator for this regulator/rectifier to work JUST PLUG IT IN AND YOU ARE GOOD TO GO!