SEG Automotive Alternator 12311711204

Alternator

The E24 M635CSi is one of BMW's great grand tourers, and keeping one healthy means a charging system you can count on.
SEG Automotive SEG Automotive
T#: 59001785 | Part#: 12311711204
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726.99 $726.99
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Ships on Nov 2, 2026
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Alternator
$726.99
The E24 M635CSi is one of BMW's great grand tourers, and keeping one healthy means a charging system you can count on. This SEG Automotive alternator is a replacement unit for the M635CSi, made by the company behind Bosch's starter and generator line. A healthy alternator keeps the battery charged and the electrical system steady on long drives and spirited runs alike. It gives owners an OE-level option when the original unit is worn out. Ideal for restorations, collectors and enthusiasts who still drive their M635CSi.

Key Features
- OE-level alternator from SEG Automotive, formerly Bosch Starter Motors and Generators.
- Replacement unit for the BMW E24 M635CSi.
- Keeps the battery and electrical system properly supplied.
- A good fit for restorations and regularly driven classics.

Specifications
- Part Number: 0120.469.806
- Brand: SEG Automotive
- Type: Alternator
- OE Reference: 12311273131
Prop 65 WarningProp 65 Warning

Cross Reference
  • 12311711204

Product Q&A

Lifetime Replacement

This product is not eligible for Lifetime Replacement
MAKE MODEL SUBMODEL ENGINE Special Fitment Notes
BMW E24 635CSi M30 3.4L Use vehicle selector to confirm fitment
*The above product applications have been written by Turner Motorsport. All warranties, product application, fitment, and performance are the responsibility of Turner Motorsport. For additional information see the terms of use.