The Toro 136-7879 Lawn Mower Voltage Regulator controls the electrical output from the charging system to maintain a stable voltage during engine operation. Designed as a replacement voltage regulator, it fits compatible Toro lawn mowers to regulate power from the alternator to the battery and electrical components. It works by converting and controlling charging voltage to help preve... https://www.wholetoolbox.com/toro-136-7879-lawn-mower-voltage-regulator