Replacement AVR KT1901B Regulator for Welding and DualPurpose Generator Sets 6Wire Overview This automatic voltage regulator model KT1901B is designed as a direct replacement part for welding generators and dualpurpose generator sets that use a 6wire AVR configuration. It stabilizes output voltage, supports consistent welding performance, and restores reliable generator operation after AVR failure. Key benefits Stable voltage output: Maintains consistent generator voltage under changing loads to reduce voltage fluctuations and improve equipment performance. Restores welding quality: Helps deliver a steady arc by regulating alternator output during welding operations. Direct replacement: 6wire configuration matches common generator wiring layouts for straightforward swapin replacement. Durable construction: Rugged housing and corrosionresistant terminals help the unit withstand workshop and field environments. Simple installation: Designed for quick installation using standard mounting points and wiring practices, minimizing downtime. Function and compatibility Function: Automatic voltage regulation for alternator excitation and sensing to keep output voltage within expected limits during normal and heavy loads. Wiring: 6wire terminal configuration for excitation, sensing, and control connections used on many dualpurpose welding and generator sets. Compatibility: Intended for use with generator sets and welding generators that specify a KT1901B style AVR with six terminals. Verify wiring diagrams and terminal labeling before installation to ensure proper fit. Performance attributes Voltage regulation capability suitable for welding and general power generation tasks. Stable operation during variable engine speeds and load changes. Compact footprint for compatibility with standard AVR mounting areas on alternator end frames. Typical applications Onsite welding repairs: a failed AVR on a welding generator at a construction or maintenance site to resume welding work quickly. Equipment maintenance: Keep rental fleet or workshop generator sets in service by stocking as a service replacement part for dualpurpose units. Backup power and farm equipment: Restore voltage control on multifunction generator sets used for both auxiliary power and welding tasks. Installation notes Confirm that the replacement matches the original KT1901B wiring layout and terminal functions before disconnecting the old regulator. Use proper safety procedures when working on electrical equipment. Deenergize the generator and follow manufacturer wiring diagrams. Tighten terminal connections to secure electrical contact and inspect mounting points for solid support. What to check before Verify that your generator set requires a KT1901B style AVR with six terminals. Compare terminal labeling and physical mounting to ensure compatibility. If in doubt, consult the equipment wiring diagram or a qualified technician for confirmation. This replacement AVR KT1901B provides a practical, compatible option to restore voltage regulation on 6wire welding and dualpurpose generator sets, helping to equipment to reliable service with minimal downtime.