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OEM Bosch Voltage Regulator (Bosch Alternator) - 12311726022

Mfg Part #
12311726022
Turner Part #
T#19326
Brand
Price:
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49.95
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Product Details

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.

This Part Fits the Following BMWs

Make Model Submodel Engine
BMW E12 528i M30 2.8L
BMW E12 530i M30 3.0L
BMW E21 320i M10 1.8L
BMW E23 733i M30 3.2L
BMW E23 735i M30 3.4L
BMW E24 630CSi M30 3.0L
BMW E24 633CSi M30 3.2L
BMW E24 635CSi M30 3.4L
BMW E24 M6 S38 3.5L
BMW E28 524td M21 2.4L
BMW E28 528e M20 2.7L
BMW E28 533i M30 3.2L
BMW E28 535i M30 3.4L
BMW E28 535is M30 3.4L
BMW E28 M5 S38 3.5L
BMW E30 318i M10 1.8L
BMW E30 318i M42 1.8L
BMW E30 318is M42 1.8L
BMW E30 325 M20 2.7L
BMW E30 325e M20 2.7L
BMW E30 325es M20 2.7L
BMW E30 325i M20 2.5L
BMW E30 325is M20 2.5L
BMW E30 325ix M20 2.5L
BMW E30 M3 S14 2.3L
BMW E32 735i M30 3.4L
BMW E32 735iL M30 3.4L
BMW E32 740i M60 4.0L
BMW E32 740iL M60 4.0L
BMW E32 750iL M70 5.0L
BMW E34 525i M20 2.5L
BMW E34 525i M50 2.5L
BMW E34 535i M30 3.4L
BMW E34 M5 S38 3.5L
BMW E36 325i M50 2.5L
BMW E36 325ic M50 2.5L
BMW E36 325is M50 2.5L
*The above product applications have been written by Turner Motorsport. All warranties, product application, fitment, and performance are the responsibility of Turner Motorsport. For additional information see the terms of use.
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