The rectifier or regulator changes the AC voltage generated in the alternator to the DC voltage of 12V used in the vehicle electrical system and keeps the voltage within a certain tolerance range. This charges the battery and ensures that incandescent lamps, for example, do not burn out.
Since this component is exposed to very high temperature loads, it is not uncommon for it to break down. If the rectifier or regulator is defective, the battery is constantly empty, with certain ignition systems the ignition system no longer works, bulbs burn out continuously or the driving light flickers.
OEM numbers for comparison purposes: Yamaha 4HM-H1960-00, 5ML-H1960-00-00 Peugeot: 737918
Some models have 2 different controllers installed, please check the plug connection before ordering and compare with the picture.