Alternator 120 Amp, External Fan, Spool Mount Product overview This alternator delivers a steady 120 amp output in a spool mount package designed for direct replacement or equipment upgrades. Key mechanical specifications are provided for accurate fitment and easy installation. The pulley is a solid design to improve conversion rates and the external fan supports cooling under sustained load. Key specifications Amperage: 120 A Item description: Alternator Mount type: Spool B plus terminal: M81.25 Fan: External Pulley type: Solid to improve conversion rates Pulley grooves: 8 Pulley outer diameter: 2.567 in / 65.2 mm Cross reference part numbers: 0120484027, 87020406, 680175652633, 9120060042, 86577814, 9120060042, AE52707, 0120484027, AH165975 Key benefits and reasons to choose this alternator Reliable electrical output: 120 amp rating supplies sufficient current for demand electrical systems and accessories. Consistent cooling: External fan design helps maintain operating temperature during extended use, reducing heatrelated performance loss. Efficient power transfer: Solid pulley construction improves conversion efficiency between engine rotation and alternator output. Broad compatibility: Multiple part numbers are provided for cross reference and straightforward matching to existing equipment or replacement needs. Straightforward connections: M81.25 B plus terminal simplifies wiring and ensures a secure electrical connection. Proper belt alignment: Eight pulley grooves and a 65.2 mm outer diameter match multirib belt systems for reliable belt engagement. Performance and build Designed for continuous duty applications where stable charging and thermal management are important. Spool mount allows secure installation in systems that require this mounting style. Pulley dimensions and groove count are specified for compatibility with standard multirib drive belts. Typical applications and use scenarios Vehicle electrical system replacement: Direct swap for alternators that match the listed part numbers and mounting style to restore charging performance in road vehicles and fleet units. Fleet and service maintenance: Suitable for scheduled maintenance programs that require a reliable 120 amp alternator with known fitment dimensions for quick replacement and minimal downtime. Equipment and industrial use: Use in stationary or mobile equipment with a spool mount and multirib drive, where sustained electrical output and thermal control are required. Installation notes Verify compatibility by cross referencing the provided part numbers and confirming B plus terminal size, pulley groove count, and spool mount dimensions. Ensure belt tension and alignment are adjusted to the equipment manufacturer recommendations to prevent premature wear. Included cross reference 0120484027, 87020406, 680175652633, 9120060042, 86577814, 9120060042, AE52707, 0120484027, AH165975 This alternator is specified for applications that require a 120 amp output, external fan cooling, spool mounting, M81.25 B plus terminal, and an 8 groove solid pulley with 2.567 in 65.2 mm outer diameter. Validate fitment against the listed part numbers before installation.