R120 AVR Automatic Voltage Regulator — Diesel Generator Stabilizer Board (Spare Part) Keep your diesel generator output steady and protect connected equipment with this R120 Automatic Voltage Regulator (AVR) stabilizer board. Designed as a direct spare part replacement, the R120 AVR restores proper voltage regulation and stabilizes generator performance when the original AVR is damaged or failing. Key benefits Restores stable generator voltage quickly — reduces voltage swings that can damage appliances and tools. Prevents overvoltage and undervoltage events — improves reliability for lights, motors, and sensitive electronics. Costeffective spare part — replaces the failed regulator without needing a full control panel replacement. Simple swapin replacement — designed to match the R120 AVR form and function for straightforward installation. What it does Automatically senses and regulates generator output voltage. Stabilizes AC output under changing load conditions to maintain consistent performance. Acts as the generator's voltage control module, helping maintain the rated voltage and protect downstream equipment. Key attributes Model: R120 Automatic Voltage Regulator (AVR) Form: Stabilizer board (printed circuit board with electronic components) Functionality: Automatic voltage regulation for diesel generator alternators Compatibility: Intended as a replacement part for generators and alternators that use the R120 AVR model Performance: Provides consistent voltage stabilization and improved output quality when installed as the correct replacement AVR Installation: Boardstyle spare part — recommended installation or verification by a qualified technician Recommended use cases Emergency backup systems: a failed AVR in a standby diesel generator to restore reliable power for a commercial or residential backup system. Construction and job site generators: Maintain stable output for power tools and lighting under variable load conditions. Industrial and workshop equipment: Protect motors, compressors, and sensitive controls from damaging voltage fluctuations by fitting a functioning R120 AVR. Installation and safety notes This product is a spare part intended to the R120 AVR board. Confirm model compatibility with your generator/alternator before installation. Disconnect battery and isolate the generator from load before attempting replacement. Installation should be performed or inspected by a qualified technician to ensure correct wiring, mounting, and safe operation. This R120 AVR stabilizer board is a practical, reliable spare for restoring automatic voltage regulation in diesel generators that specify the R120 model. a failing AVR to regain stable, safer generator output and protect connected equipment.