MPA Electrical 13987N Alternator

Alternator for Dodge Ram 2500 and Ram 3500

MPA Electrical Part Number 13987N is a 12-volt alternator built for 2003-2005 Dodge Ram 2500 and 2003-2005 Dodge Ram 3500 applications. It features 136 amps of output, an internal fan, an external regulator, and an 8-groove serpentine pulley for the specified charging system setup.

Key Features

• 136 amp output for charging-system service
• 12-volt electrical system application
• Internal fan design
• External regulator configuration
• 8-groove serpentine pulley
• Clockwise rotation with 2:00 clock position
• Built by Bosch for MPA Electrical

Product Details

This MPA Electrical alternator, part number 13987N, is specified for Dodge Ram 2500 and Dodge Ram 3500 trucks from 2003 through 2005. The unit is configured with clockwise rotation, a 2:00 clock position, and an external regulator, making it a direct-match choice for vehicles that require these exact charging-system characteristics. If you are searching for a 2003-2005 Dodge Ram 2500 alternator or a 2003-2005 Dodge Ram 3500 alternator, this listing aligns with the confirmed fitment and electrical specifications.

The Bosch-built design and 136 amp rating support the vehicle’s charging demands while the internal fan and serpentine pulley layout match the listed application details. Part number 13987N is also a useful reference when verifying the correct replacement against the original unit.

Common Problems This Part Can Address

• Battery warning light caused by alternator output loss
• Low charging voltage during normal driving
• Electrical system instability from a failing alternator
• Dim lights or accessory performance issues related to charging output
• Starting problems tied to insufficient battery recharge

Installation Notes and Tips

Confirm the pulley groove count, regulator type, rotation direction, and clock position before installation. Verify that the replacement matches the vehicle’s charging-system configuration on 2003-2005 Dodge Ram 2500 and 2003-2005 Dodge Ram 3500 models. Inspect the belt condition, electrical connectors, and charging cables during replacement to help ensure proper system operation.

Quality Assurance

MPA Electrical sources this alternator with Bosch manufacturing support and publishes the key electrical and mounting specifications needed for accurate replacement selection. Use the confirmed fitment and part number 13987N to verify application before installation.