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Alternator

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 Valeo Alternator - 180amp - E9X M3 S65
Valeo - Corporate Logo
T#:377508
Part#: 12317837981
Direct Ship, Expected Ship Date: May 18, 2021
Sale - Save 5% $301.22
$286.16
Sale - Save 5% $301.22
$286.16
This is a NEW alternator from the OEM manufacturer, Valeo. No core charge applies. Valeo is an OEM manufacturer for many BMW alternators - save money by buying the same alternator in a different box!
Genuine BMW Alternator Positive Cable
Genuine BMW - Corporate Logo
T#:40118
Part#: 12521312124
In Stock
18% off MSRP $44.34
$36.47
Free Shipping on orders $49 and up
18% off MSRP $44.34
$36.47
Free Shipping on orders $49 and up


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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OEM Bosch Voltage Regulator (Bosch Alternator) - 12311726022
Bosch - Corporate Logo
T#:19326
Part#: 12311726022
Direct Ship, Expected Ship Date: May 18, 2021
$53.11
$53.11
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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Large HD Polyurethane Alternator Bushings - Set of 4
Turner Motorsport - Corporate Logo
T#:359471
Part#: TMS3458KT
In Stock
Sale - Save 10% $27.95
$25.16
Free Shipping on orders $49 and up
Sale - Save 10% $27.95
$25.16
Free Shipping on orders $49 and up

Trouble trying to get your alternator tensioned or aligned properly? This is a common issue due to the rubber bushings wearing with age or degrading from exposure to the elements, oil, or other contaminants.

Restore proper alignment and tensioning function to your alternator with these Heavy Duty Alternator Polyurethane Bushings.

These will resist pressure and any possible contaminants for much longer than stock rubber bushings, making these a likely one time solution to your alternator issues!

Replaces BMW part # 12311268433. Most cars require four.

This item fits the following BMWs:
1977-1983 E21 BMW 320i
1984-1988 E30 BMW 318i 325e 325es
1988-1991 E30 BMW M3
1976-1981 E12 BMW 528i 530i
1982-1988 E28 BMW 528e 533i 535i M5
1982-1989 E24 BMW 633csi 635csi M6
1981-1987 E23 BMW 733i 735i

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Genuine BMW Alternator Adjusting Bar - E30 325e 325i, E28 528e
Genuine BMW - Corporate Logo
T#:7124
Part#: 12311274833
In Stock
$41.95
Free Shipping on orders $49 and up
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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Bosch Alternator - 140 amp - E36, E36 M3, E34 (M50), MZ3 (S52)
Bosch - Corporate Logo
T#:338549
Part#: AL0739X
Expected Ship Date: 1-3 days
Starting at $317.95
Free Shipping
Starting at $317.95
Free Shipping
Replacement 140 amp Bosch alternator for the M50, M52, S50 and S52 engine, found in many BMW's between 1992 2000. The 80 amp alternator is the standard size for most 3 series. The 140 amp is an upgrade, deliverying more power to your electrical system, ideal for cars with more electrical items (such as high powered stereo systems, convertible tops, etc). Bosch is an original equipment supplier to BMW, and is the finest and most recognized German brand of alternator available. Buy only the best alternator for your BMW -- buy a Bosch alternator.

Note: this alternator does not come with a pulley. Bosch does not supply any pulley with this during their rebuilds.
If you are replacing an existing 140a alternator, simply re-use your original pulley.
If you are replacing a Bosch alternator of a different amp, measure your existing pulley and confirm it is 55mm in diameter.
If you are replacing a Valeo brand alternator, you will need to also purchase the 55mm alternator pulley from the menu below. Your original Valeo pulley will not work on the new Bosch alternator.

Bosch is one of the largest OEM producers of Genuine BMW and aftermarket parts in the world, providing parts for almost every major automotive manufacturer. Bosch has likely supplied many of the original electrical (and mechanical) parts for your BMW. Thanks to their exacting assembly process and high level of durability you can expect a long service life from all Bosch products.

A $70.00 refundable core charge must be applied to this alternator. Upon receipt of your rebuildable alternator core, you will be refunded the core charge.

This Bosch Alternator fits the following BMWs:
1991-1992 E34 5 Series 525i (with 24 valve M50 engine)
1992-1995 E36 3 Series 6 cylinder - 325i, 325is
1996-1998 E36 3 Series 6 cylinder - 328i, 328is, 323is
1995-1999 E36 M3 all, including M3 3.0 liter and M3 3.2 liter
1998-2000 MZ3 M Roadster (with S52 engine)
1999-2000 MZ3 M Coupe (with S52 engine)