Part Numbers: 1500664100, 15006640100, 686696102220 Overview This 50 amp alternator provides reliable charging for a wide range of equipment and vehicles. Designed with an internal regulator and negative polarity, it offers straightforward installation and stable electrical output. Key mounting options and an 87 mm lead support common conversion and replacement needs. Key benefits Reliable charging: 50 A output maintains battery charge and supports electrical accessories to prevent voltage drop during operation. Simplified installation: Internal regulator reduces external wiring complexity and trimming during replacement. Clear polarity and rotation: Negative polarity and clockwise rotation match many stock and retrofit applications for direct swap compatibility. Flexible mounting: Two mounting ear options accommodate different setups: M81.25 threaded on one ear and 8.3 mm unthreaded on the other ear to improve conversion rates. Readytowire lead: 87 mm lead allows easier connection to existing wiring harnesses without extensive modification. Important attributes Amperage: 50 A Polarity: Negative Regulator: Internal Rotation: Clockwise Lead length: 87 mm Mounting ear 1: M81.25 threaded Mounting ear 2: 8.3 mm unthreaded Compatible part numbers: 1500664100, 15006640100, 686696102220 Performance and fit considerations Matches systems requiring negativeground electrical configuration and clockwise rotation. Internal regulator provides stable voltage control when replacing alternators with builtin regulation. Two different mounting ear styles allow for easier conversion from varied original equipment mounting arrangements. Typical applications Replacement alternator for light commercial vehicles and vans requiring 50 A charging capacity and clockwise rotation. Retrofit for agricultural or construction equipment where original alternator mounting varies and conversion to a threaded or unthreaded ear is needed. Use in auxiliary power systems or stationary generators that require a compact alternator with internal regulation and a ready 87 mm connection lead. What to check before ordering Confirm vehicle or equipment requires a 50 A alternator with negative polarity and clockwise rotation. Verify that the M81.25 threaded and 8.3 mm unthreaded ear configuration will align with your mounting points. Measure clearance and wiring compatibility for the 87 mm lead to ensure proper fit and connection. This alternator is a direct specification match for the listed part numbers and provides a practical replacement option for systems that meet the stated electrical and mounting requirements.