2016-2019 BMW 7 Series 4.4 Alternator 12318611280
Specifications
OEM number
12318611280
Donor year
2016
Body style
Sedan
Fuel
Gas
Engine size
4.4 L
Transmission
Auto
Drivetrain
AWD
Suspension
Air
Trim
Xdrive m package
Donor mileage
87000
Paint code
A89 Imperial Blue Brilliant Effect
About this part
Also known as
Alternator
Generator
AC Generator
Alternator Assembly
Charge Generator
Charging Unit
What this part does
The alternator is a critical electromechanical component driven by the engine accessory belt, designed to convert mechanical energy into alternating current which is then rectified to direct current. It is responsible for keeping the battery charged and supplying stable electrical power to all vehicle modules, sensors, and accessories while the engine is running. When this unit begins to fail, the electrical system falls back on battery reserve, which triggers warning lights, disables non-essential systems to shed load, and ultimately results in the vehicle stalling once voltage drops below the threshold required by the engine control module.
Fits these vehicles
| Make | Model | Years | Engine |
|---|---|---|---|
| BMW | 7 Series (750i, 750Li) | 2016-2019 | 4.4L |
| BMW | 5 Series (M550i) | 2018-2020 | 4.4L |
| BMW | X5 (xDrive50i) | 2019-2020 | 4.4L |
| BMW | X7 (xDrive50i) | 2019-2020 | 4.4L |
OEM and interchange numbers
12318611280
12-31-8-611-280
12 31 8 611 280
8611280
Before you order
Modern BMW charging systems utilize intelligent power management that adjusts alternator output based on battery age and condition. If you are replacing the battery alongside this unit, the new battery must be registered to the vehicle using an advanced scan tool. Failure to register the battery or clear historical power management faults can cause the engine computer to overwork the replacement alternator, leading to premature failure. Always confirm the amperage rating and pulley groove count on your original unit matches this replacement.
