MPA Electrical 13405 Alternator

Remanufactured Alternator for BMW 325i

MPA Electrical Part Number 13405 is a remanufactured 12-volt alternator built for OE fit, form, and function. It is engineered for 1991 BMW 325i, 325is, and 325iX applications and delivers 140 amps of charging output with an internal regulator.

Key Features

• Remanufactured alternator for charging system replacement
• 12.0-volt electrical system with 140.0 amp output
• Internal regulator for integrated voltage control
• External fan design
• Clockwise (right) rotation
• Bosch family unit
• No pulley included
• Plug clock rear view main mounting ear at 6 o'clock: 9

Product Details

MPA Electrical 13405 is a remanufactured alternator for BMW charging system service, including 1991 BMW 325i, 1991 BMW 325is, and 1991 BMW 325iX. The remanufacturing process combines OE-style fit and function with modern testing methods to help ensure the unit meets replacement requirements for the vehicle’s electrical system. This alternator is part of MPA Electrical’s Remanufactured line, which focuses on OE replacement coverage for charging and starting components.

This part cross-references BMW and GM applications, including 12-31-1-735-404 and 19134126 for the same application.

What It Helps Solve

• Low battery charging caused by a failing alternator
• Dim lights or unstable electrical output
• Battery warning light concerns related to charging performance
• Charging system noise or inconsistent voltage regulation
• Replacement needs for a worn OE alternator on BMW 325i, 325is, or 325iX

Installation Notes and Tips

Verify pulley requirements before installation, since no pulley is included. Confirm the connector orientation, mounting ear position, rotation direction, and amperage rating against the original unit before fitting. For BMW 325i, 325is, and 325iX charging system service, compare the Bosch-family configuration and plug clocking to the removed alternator to ensure proper alignment.

Quality Assurance

MPA Electrical remanufactured alternators are processed and tested to support OE-style replacement performance. The brand’s remanufacturing approach uses current testing technology to help verify fit, form, and function before installation.