MPA Electrical 8307803 Alternator - Upper

Ford Super Duty Alternator, 135 Amp

MPA Electrical 8307803 is a remanufactured 12-volt alternator built for Ford charging systems that require a 135 amp output, internal regulation, and clockwise rotation. It is a direct-fit replacement for select Ford E-350 Super Duty, F-250 Super Duty, and F-350 Super Duty applications with the specified pulley and clock position.

Key Features

• 135 amp output for Ford charging system service
• 12 volt alternator with internal regulator
• Internal fan design
• 8-groove serpentine pulley
• Clock position: 2:30
• Clockwise rotation
• Remanufactured by MPA Electrical

Product Details

This MPA Electrical remanufactured alternator, part number 8307803, is built for Ford trucks and vans that use the listed OE-style charging configuration. It cross-references Anchor 8307 for the same application. Use this alternator when servicing a Ford E-350 Super Duty, F-250 Super Duty, or F-350 Super Duty charging system that calls for a 135 amp unit with an internal regulator and 8-groove serpentine pulley. The part number 8307803 is also referenced by OE-style interchange numbers including 3C3T-10300-BA and 6C2Z-10346-DA.

Vehicle Fitment

• Fits 2004-2010 Ford E-350 Super Duty, Upper, Dual Alt. System, Upper Unit; Remanufactured
• Fits 2010 Ford E-350 Super Duty, N/A, w/ Single alt. system, w/ Optional 135 amp alt.; Remanufactured
• Fits 2004-2009 Ford E-350 Super Duty, N/A, w/ Single alt. system, Optional, w/ 135 amp alt.; Remanufactured
• Fits 2005 Ford F-250 Super Duty, Upper, Dual Alt. System, Upper Unit, to 11/3/04; Remanufactured
• Fits 2005 Ford F-350 Super Duty, Upper, Dual Alt. System, Upper Unit, to 11/3/04; Remanufactured
• Fits 2003-2004 Ford F-250 Super Duty, Upper, Dual Alt. System, Upper Unit; Remanufactured
• Fits 2003-2004 Ford F-350 Super Duty, Upper, Dual Alt. System, Upper Unit; Remanufactured

Common Uses

• Restores charging output when the battery is not staying charged
• Addresses dim lights or electrical load issues caused by weak alternator output
• Replaces a failed internal regulator in the charging system
• Corrects belt-drive concerns when the original pulley or rotation specification must match OE
• Supports repair of Ford Super Duty dual-alternator and optional 135 amp single-alternator setups

Installation Notes and Tips

Verify the vehicle’s alternator configuration, pulley groove count, clock position, and rotation before installation. This part is specified for Ford applications with an upper-unit dual alternator setup or the listed single-alternator 135 amp configuration, so matching the original unit is important for proper fitment. Confirm connector style and mounting points against the removed alternator and vehicle build date.

Quality Assurance

MPA Electrical remanufactured components are rebuilt for service replacement use and are identified by the original application specifications listed above. Part number 8307803 is intended for direct replacement in the confirmed Ford Super Duty fitments shown here.