Alternator for BMW E34 M5 S38 3.5L

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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.
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OEM Bosch Voltage Regulator (Bosch Alternator) - 12311726022
OEM Bosch Voltage Regulator (Bosch Alternator) - 12311726022 ...
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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
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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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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...
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Schaeffler - Corporate Logo
T#:41965072
Part#: 6201-Z
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$ 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
Genuine BMW Alternator Brush Set
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Genuine BMW - Corporate Logo
T#:7133
Part#: 12311727756
Ships in 1 day
4% off MSRP $ 25.99

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$ 24.99 USD
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$ 25.99

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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
Genuine BMW Alternator Fan
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Genuine BMW - Corporate Logo
T#:38896
Part#: 12311735306
Ships in 1 day
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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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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Alternator / PS / AC Idler Nut
Alternator / PS / AC Idler Nut
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Genuine BMW - Corporate Logo
T#:7139
Part#: 12317677914
In Stock
$ 15.24

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$ 15.23 USD
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GENUINE BMW ENGINE ELECTRICAL IDLER 12317677914
Washer
Washer
10X5,3X1-200 Hv
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Genuine BMW - Corporate Logo
T#:215808
Part#: 07119904206
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$ 1.99 USD
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$ 1.99 USD
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Genuine BMW Washer - 07119904206

Condenser - E31, E32, E34
Condenser - E31, E32, E34
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Genuine BMW - Corporate Logo
T#:181023
Part#: 12311722989
Ships in 4 Business Days
4% off MSRP $ 26.99

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

$ 25.99 USD
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$ 26.99

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Genuine BMW Condenser
This item fits the following BMW Chassis:
E34 M5,E34

Fits BMW Engines including:
M30,M70,S38,S70

Set Mounting Parts - E32, E34
Set Mounting Parts - E32, E34
B+/D+
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Genuine BMW - Corporate Logo
T#:7132
Part#: 12311722985
Ships in 4 Business Days
4% off MSRP $ 55.99

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

$ 53.99 USD
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$ 55.99

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$ 53.99 USD
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Genuine BMW Set Mounting Parts - B+/D+
This item fits the following BMW Chassis:
E34 M5,E34

Fits BMW Engines including:
M20,M30,S38

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