Alternator for BMW 5 Series E28 (1982-1988)

Genuine BMW Alternator Adjusting Bar - E30 325e 325i, E28 528e ...

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T#:7124

Part#: 12311274833

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$ 44.99 USD

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Replace the alternator adjuster on BMW's with the M20 engine with this Genuine BMW part. Over time this part can become corroded or the teeth can become stripped.

When doing any sort of repair or maintenance there is no replacement for genuine factory parts. Turner Motorsport carries the Genuine BMW brand with pride and has the parts you need to complete your next project with confidence.

This item fits the following BMWs:
1984-1991 E30 BMW 325e 325es 325i 325ic 325is 325ix
1982-1988 E28 BMW 528e

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OEM Bosch Voltage Regulator (Bosch Alternator) - 12311726022 ...

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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

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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.

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Genuine BMW Alternator Bushing (20 mm Length) - E10 E12 E21 E23 E24 E...

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T#:22410

Part#: 12311268447

Ships in 1-2 days

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

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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

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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

Genuine BMW Alternator Pulley - 66mm - M20 2.5L

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T#:19315

Part#: 12311288238

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5% off MSRP $ 109.99

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

$ 103.99 USD

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$ 109.99

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$ 103.99 USD

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Genuine BMW Pulley - D=66mm

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

Fits BMW Engines including:
M10,M20,S14

Genuine BMW Alternator Positive Cable

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T#:40118

Part#: 12521312124

Ships in 1-2 days

6% off MSRP $ 50.99

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

$ 47.99 USD

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6% off MSRP

$ 50.99

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

$ 47.99 USD

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Genuine BMW Ground Cable Alternator - L=170mm

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

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

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SKF Alternator Ball Bearing 47X17X14 - Multiple BMWs

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T#:2602208

Part#: 12311722979

Ships in 9 Business Days

$ 29.99 USD

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SKF Grooved Ball Bearing - 47X17X14 This item fits the following BMW Chassis: E30 M3,E34 M5,E30,E34,E36 Fits BMW Engines including: M10,M20,M30,M42,S14,S38

OEM Schaeffler Alternator Bearing - BMW E21 E30 E36 E12 E28 E34 E23 E...

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T#:41965072

Part#: 6201-Z

Ships in 7 Business Days

$ 30.99 USD

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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.

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Genuine BMW Alternator Brush Set

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T#:7133

Part#: 12311727756

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4% off MSRP $ 25.99

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$ 24.99 USD

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$ 25.99

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$ 24.99 USD

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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

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Genuine BMW Alternator Fan

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T#:38896

Part#: 12311735306

Ships in 1-2 days

4% off MSRP $ 49.99

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

$ 47.99 USD

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$ 49.99

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$ 47.99 USD

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Genuine BMW Fan Wheel

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

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

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Bush - E23, E24, E28, E30

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T#:38731

Part#: 12311276227

Ships in 1-2 days

3% off MSRP $ 31.99

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

$ 30.99 USD

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3% off MSRP

$ 31.99

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

$ 30.99 USD

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Genuine BMW Bush

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

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

Genuine BMW Alternator Bushing (Red) (8 mm Length) - E10 E12 E21 E23 ...

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T#:22411

Part#: 12311268449

Ships in 5 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

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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

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Genuine BMW Bush - 90 Shore Kurz

Fits BMW Engines including:
M10,M20,M30

Fan Wheel - E10, E12, E21, E23, E24, E28, E3, E9

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T#:38759

Part#: 12311350199

Ships in 6 Business Days

4% 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.

$ 51.99 USD

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$ 53.99

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

$ 51.99 USD

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Genuine BMW FAN WHEEL

Fits BMW Engines including:
M10,M20,M30

Alternator / PS / AC Idler Nut

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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

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$ 15.23 USD

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GENUINE BMW ENGINE ELECTRICAL IDLER 12317677914

Woodruff Key

4X5

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T#:28561

Part#: 07119951453

In Stock

$ 3.99 USD

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$ 3.99 USD

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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

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