Bosch AL7657N Alternator

Bosch AL7657N Alternator Overview

The Bosch AL7657N is a new 12-volt alternator built for charging-system service on select Ford Super Duty and E-Series applications. It features a 120-amp rating, internal fan and internal regulator design, aluminum case construction, and a 6-groove pulley for OE-style fitment.

Bosch Alternator (New) products are part of Bosch’s charging-system line, focused on replacement units that are built and tested for dependable electrical performance and consistent operation.

• 12-volt alternator with 120-amp output
• New unit with aluminum case and aluminum case color
• Internal fan and internal regulator
• Clockwise rotation
• 6-groove pulley included; 66 mm outside pulley diameter
• External fan included and external regulator included
• Plug type 334 with rear-view plug clocking at 6 o’clock
• Fits Ford E-350 Super Duty, Ford F-250 Super Duty, Ford F-350 Super Duty, and Ford E-350 Club Wagon applications listed below

Fitment Details

• Fits 2004-2010 Ford E-350 Super Duty, N/A; located on bottom; to 120 amp alternator; with dual alternators; alternator (new)
• Fits 2003-2007 Ford F-250 Super Duty, N/A; located on bottom; to 120 amp alternator; with dual alternators; alternator (new)
• Fits 2003-2007 Ford F-350 Super Duty, N/A; located on bottom; to 120 amp alternator; with dual alternators; alternator (new)
• Fits 2004-2005 Ford E-350 Club Wagon, N/A; located on bottom; to 120 amp alternator; with dual alternators; alternator (new)

Detailed Description

This Bosch AL7657N alternator is a direct replacement-style charging component for Ford E-350 Super Duty, F-250 Super Duty, F-350 Super Duty, and E-350 Club Wagon vehicles equipped with dual alternators and a bottom-mounted layout. The 120-amp output, internal regulation, and clockwise rotation support stable charging performance in the specified applications. The aluminum housing and 6S pulley configuration are matched to the listed OE-style requirements, and the unit cross-references Bosch application numbers 3C3Z10346CA and 6C2Z10346EA for the same use case.

Common Problems This Part Can Address

• Low battery charging caused by a worn alternator
• Dim lights or electrical instability from insufficient output
• Battery warning light triggered by charging-system faults
• Accessory performance issues related to weak system voltage
• Noise or belt-drive concerns tied to alternator wear

Installation Notes and Tips

Verify the vehicle uses the bottom-mounted, dual-alternator configuration and matches the listed 120-amp application before installation. Confirm plug type 334, pulley style, and rear-view plug clocking at 6 o’clock to ensure proper connector and belt alignment. Inspect the belt, tensioner, and charging connections during replacement so the new alternator can operate within the correct system specifications.

Quality Assurance

Bosch Premium Alternators are built and tested to deliver consistent performance and reliability in charging-system service. The AL7657N is a new replacement alternator designed to meet the electrical and fitment requirements of the listed Ford applications.