MPA Electrical 6646S Starter Motor

Remanufactured Starter for Ford Applications

MPA Electrical 6646S is a remanufactured 12-volt starter built for Ford applications that need a clockwise-rotation, permanent magnet gear reduction design. With a 1.4 kW rating and 12-tooth drive, it is specified for a range of Ford, Lincoln, and Super Duty truck applications, including Mustang, F-150, Expedition, Navigator, and Mark LT coverage.

The MPA Electrical Remanufactured line focuses on rebuilt starting and charging components for direct replacement use. Part number 6646S is built to match the listed OE-style application requirements for Ford starter replacement service.

• Permanent magnet gear reduction starter design
• 1.4 kW output rating
• 12-volt electrical system
• Clockwise rotation
• 12-tooth drive
• Fits a wide range of Ford and Lincoln truck and SUV applications

Detailed Product Overview

This remanufactured starter is used in Ford and Lincoln vehicles that require the specified 12-volt, clockwise starter configuration. It is listed for applications such as 2005-2014 Ford Mustang, 1999-2012 Ford F-150, 2007-2014 Ford Expedition, 1999-2008 Ford F-250 Super Duty, 1999-2008 Ford F-350 Super Duty, and 1999-2004 Lincoln Navigator. Part number 6646S also cross-references AMS Automotive 6646 for the same application.

Use this starter when replacing a worn unit on Ford F-150, Mustang, or Super Duty trucks where the OE-style starter specification calls for a permanent magnet gear reduction unit with a 12-tooth drive.

Common Problems This Starter Can Address

• Engine cranking slowly or inconsistently
• No-crank condition when the battery and cables test properly
• Starter motor clicking without engine engagement
• Intermittent starting on Ford truck, SUV, or Mustang applications
• Starter wear related to high-mileage daily use

Installation Notes and Fitment Tips

Verify the vehicle’s starter specification before installation, especially on Ford F-250 Super Duty and F-350 Super Duty models with date-specific coverage noted in the fitment data. Confirm 12-volt system requirements, clockwise rotation, and 12-tooth drive engagement before replacing the original unit. Fits 2005-2014 Ford Mustang, N/A; Fits 1999-2012 Ford F-150, N/A; Fits 2007-2014 Ford Expedition, N/A; Fits 1999-2008 Ford F-250 Super Duty, N/A; Fits 1999-2008 Ford F-350 Super Duty, N/A; Fits 1999-2004 Lincoln Navigator, N/A.

Quality Assurance

MPA Electrical remanufactured starters are rebuilt for direct replacement service in listed Ford and Lincoln applications. Part number 6646S is supported by the provided OE-style fitment data and interchange references for application matching.