Alternator for BMW E21 320i M10 1.8L

Clear BMW chassis

Please ensure your correct model is selected

The alternator keeps the battery in a constant state of charge anytime the engine is running. If your lights are dimming or you hear excessive bearing noise around the alternator, chances are that it's time for a replacement.
Sort By:
OEM Bosch Voltage Regulator (Bosch Alternator) - 12311726022
OEM Bosch Voltage Regulator (Bosch Alternator) - 12311726022 ...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Bosch - Corporate Logo
T#:19326
Part#: 12311726022
In Stock at Vendor
$ 71.99

This product was last offered at the strikethrough price on
01-28-2026

$ 63.99 USD
Free Shipping on orders $49 and up
Add to Wish List
$ 63.99 USD
Free Shipping on orders $49 and up
Add to Wish List
This is the voltage regulator found on the back of the alternator. It's a normal wear item and the contacts are the first thing to check if you believe the alternator is not charging the battery (lights flickering or dim, battery light on in the dash, the engine quits without warning, or other electrical failures). The voltage regulator manages the voltage flowing through the car, especially to and from the battery. There are two carbon contacts on the regulator that control the magnetic field when the alternator is spinning and these contacts wear over time. A new set of contacts will be about 13mm in length. Anything less than 5mm and the voltage regulator should be replaced, regardless if that is the cause of your electrical problems or not. Most older mechanics will tell you to keep a spare regulator in your toolbox.

The carbon contacts can be replaced on their own but requires desoldering the old ones from the base and then soldering the new ones on. It may be easier to just replace the unit as a whole.

This is the OEM voltage regulator, made by Bosch or Hella. It's the one with the white base and fits most Bosch alternators from 1977-1995 (Valeo and other alternators look very different and have a black cover and base). This part number replaces the previous BMW part numbers - 12311271664, 12321279548, 12311722755, 12321711399 and Bosch part numbers 1197311021 and 1197311028.
Show More Show Less
Genuine BMW Alternator Bushing (20 mm Length) - E10 E12 E21 E23 E24 E28 E3 E30
Genuine BMW Alternator Bushing (20 mm Length) - E10 E12 E21 E23 E24 E...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:22410
Part#: 12311268447
Ships in 1 day
4% off MSRP $ 45.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 43.99 USD
Free Shipping on orders $49 and up
Add to Wish List
4% off MSRP
$ 45.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 43.99 USD
Free Shipping on orders $49 and up
Add to Wish List


Genuine BMW Bush - 90 Shore Lang

This item fits the following BMW Chassis:
E30 M3,E30

Fits BMW Engines including:
M10,M20,M30,S14,S38

OEM Schaeffler Alternator Bearing - BMW E21 E30 E36 E12 E28 E34 E23 E32
OEM Schaeffler Alternator Bearing - BMW E21 E30 E36 E12 E28 E34 E23 E...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Schaeffler - Corporate Logo
T#:41965072
Part#: 6201-Z
Ships in 7 Business Days
$ 30.99 USD
Free Shipping on orders $49 and up
Add to Wish List
$ 30.99 USD
Free Shipping on orders $49 and up
Add to Wish List
Offered by OEM Schaeffler, this bearing replaces BMW part number 12311739203, which is found in numerous BMW alternators manufactured prior to 1996. This bearing helps to stabilize the shaft of the alternator, allowing it to spin freely. If you are experiencing a loud squeaking or grinding noise from your alternator, there is a good chance one of the internal bearings has failed and needs to be replaced.
Show More Show Less
Genuine BMW Alternator Brush Set
Genuine BMW Alternator Brush Set
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:7133
Part#: 12311727756
Ships in 1 day
4% off MSRP $ 25.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 24.99 USD
Free Shipping on orders $49 and up
Add to Wish List
4% off MSRP
$ 25.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 24.99 USD
Free Shipping on orders $49 and up
Add to Wish List


Genuine BMW Carbon Brush Set

This item fits the following BMW Chassis:
E30 M3,E34 M5,E30,E34,E36

Fits BMW Engines including:
M10,M20,M30,M42,M50,M70,S14,S38,S70

Show More Show Less
Genuine BMW Alternator Bushing (Red) (8 mm Length) - E10 E12 E21 E23 E24 E28 E3
Genuine BMW Alternator Bushing (Red) (8 mm Length) - E10 E12 E21 E23 ...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:22411
Part#: 12311268449
Ships in 2 Business Days
5% off MSRP $ 40.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 38.99 USD
Free Shipping on orders $49 and up
Add to Wish List
5% off MSRP
$ 40.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 38.99 USD
Free Shipping on orders $49 and up
Add to Wish List


Genuine BMW Bush - 90 Shore Kurz

Fits BMW Engines including:
M10,M20,M30

Fan Wheel - E10, E12, E21, E23, E24, E28, E3, E9
Fan Wheel - E10, E12, E21, E23, E24, E28, E3, E9
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:38759
Part#: 12311350199
Ships in 5 Business Days
6% off MSRP $ 53.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 50.99 USD
Free Shipping on orders $49 and up
Add to Wish List
6% off MSRP
$ 53.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 50.99 USD
Free Shipping on orders $49 and up
Add to Wish List


Genuine BMW FAN WHEEL

Fits BMW Engines including:
M10,M20,M30

Supporting Bracket - E10, E21
Supporting Bracket - E10, E21
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:39076
Part#: 12318602032
Ships in 5 Business Days
6% off MSRP $ 82.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 77.99 USD
Free Shipping on orders $49 and up
Add to Wish List
6% off MSRP
$ 82.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 77.99 USD
Free Shipping on orders $49 and up
Add to Wish List


Genuine BMW SUPPORTING BRACKET

Fits BMW Engines including:
M10

Woodruff Key
Woodruff Key
4X5
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:28561
Part#: 07119951453
In Stock
$ 3.99 USD
Free Shipping on orders $49 and up
Add to Wish List
$ 3.99 USD
Free Shipping on orders $49 and up
Add to Wish List


Genuine BMW Woodruff Key
This item fits the following BMW Chassis:
E30 M3,E70 X5M,E71 X6M,E53 48IS,E30,E34,E36,E53 X5 X5,E63,E65,E70 X5,E71 X6,F01,F02,F06,F10,F12,F13,F15,F16

Show More Show Less
Alternator / PS / AC Idler Nut
Alternator / PS / AC Idler Nut
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:7139
Part#: 12317677914
In Stock
$ 15.24

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 15.23 USD
Free Shipping on orders $49 and up
Add to Wish List
$ 15.23 USD
Free Shipping on orders $49 and up
Add to Wish List
GENUINE BMW ENGINE ELECTRICAL IDLER 12317677914
Febi Alternator Mount Bushing - E12, E21, E23, E24, E28, E30
Febi Alternator Mount Bushing - E12, E21, E23, E24, E28, E30 ...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!
Febi - Corporate Logo
T#:381815
Part#: 12311268433
In Stock
$ 3.99

This product was last offered at the strikethrough price on
12-18-2025

$ 2.99 USD
Free Shipping on orders $49 and up
Add to Wish List
$ 2.99 USD
Free Shipping on orders $49 and up
Add to Wish List
Reduces alternator vibration.
OEM Bosch Starter Relay - E21 320i
OEM Bosch Starter Relay - E21 320i
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Bosch - Corporate Logo
T#:583822
Part#: 61311243207
In Stock at Vendor
$ 4.99 USD
Free Shipping on orders $49 and up
Add to Wish List
$ 4.99 USD
Free Shipping on orders $49 and up
Add to Wish List
This is a brand new starter relay from OEM supplier Bosch. If you have replaced your starter and have ruled out every other issue, this relay could restore your starters operation and get your car back up and running.
Show More Show Less
Washer - E12, E21, E23, E24, E28, E30
Washer - E12, E21, E23, E24, E28, E30
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:38719
Part#: 12311268420
Ships in 1 day
$ 10.99 USD
Free Shipping on orders $49 and up
Add to Wish List
$ 10.99 USD
Free Shipping on orders $49 and up
Add to Wish List


Genuine BMW Washer

This item fits the following BMW Chassis:
E30 M3,E30

Fits BMW Engines including:
M10,M20,M30,S14,S38

Washer
Washer
10X5,3X1-200 Hv
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:215808
Part#: 07119904206
Ships in 1 day
$ 1.99 USD
Free Shipping on orders $49 and up
Add to Wish List
$ 1.99 USD
Free Shipping on orders $49 and up
Add to Wish List


Genuine BMW Washer - 07119904206

Adjusting Bar - E21
Adjusting Bar - E21
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:7140
Part#: 12318602037
Ships in 5 Business Days
3% off MSRP $ 35.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 34.99 USD
Free Shipping on orders $49 and up
Add to Wish List
3% off MSRP
$ 35.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 34.99 USD
Free Shipping on orders $49 and up
Add to Wish List


Genuine BMW ENGINE ELECTRICAL ADJUSTING BAR 12318602037.--

This item fits the following BMWs:
BMW 1600, 2002, 2002tii
BMW 3 Series - 320i

--.

Fits BMW Engines including:
M10

Show More Show Less
Genuine BMW Engine Electrical Adjusting Bar 12311273638
Genuine BMW Engine Electrical Adjusting Bar 12311273638
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:7122
Part#: 12311273638
Special Order: No Guaranteed ETA
4% off MSRP $ 48.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 46.99 USD
Free Shipping on orders $49 and up
Add to Wish List
4% off MSRP
$ 48.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 46.99 USD
Free Shipping on orders $49 and up
Add to Wish List


Genuine BMW ENGINE ELECTRICAL ADJUSTING BAR 12311273638.--

This item fits the following BMWs:
BMW 3 Series - 320i

--.

Fits BMW Engines including:
M10

Show More Show Less

Select Vehicle

BMW Mini
Clear Vehicle

Category

Brand

Price

$
$

Narrow Results