-
FG18S066 → Valeo original manufacturer part number (also appears as FGN18S066 in some listings). This is the core OE supplier code for the alternator.
-
12318509244 and 12318509225 → Genuine BMW OEM part numbers (12 31 8 509 244 / 12 31 8 509 225; often interchangeable or superseding each other). 12318509244 is frequently the primary/later reference.
-
439811 and 440465 → Valeo remanufactured or variant references (439811 for new/IR/IF spec, 440465 for reman premium). These directly tie back to the same FG18S066-based unit in Valeo catalogs and aftermarket cross-lists.
Key Specifications (Confirmed from OEM/Supplier Data)
-
Output: 180A (high-output for diesel variants; supports heavy loads without voltage drops)
-
Voltage: 14V charging system (12V nominal)
-
Pulley: 6-groove (6PK/S6) with overrunning alternator pulley (OAP/freewheel), diameter ≈53–55mm
-
Rotation: Clockwise (CW)
-
Regulator: Integrated IR/IF (internal regulator), COM/LIN bus compatible for BMW smart charging and ECU integration
-
Mounting: 3 mounting holes/points, position L 95° (double pivot lever/fastening)
-
B+ Connection: M8 stud
-
Other Common Crosses: 12318509224 (related variant), 215.577.180.xxx (PSH reman), LRA03614, etc.
Common Compatible BMW Models
Primarily N57 diesel variants (2012–2018+ range, depending on market/region; strong in Europe and Asia including Singapore imports):
-
3 Series (F30/F31/F34/F35/F80): 330d, 335d, 330d xDrive
-
4 Series (F32/F33/F36): 430d, 435d
-
Other Related: Some 5 Series (F10 late), X3/X4/X5 diesel cross-overs with N57 (e.g., select 30d/35d), but primary fit is F30/F32 platforms
This is the standard 180A alternator for these models (up from lower-amp base units in some configs).
EN
