Voltage Regulator, Genuine BMW - E46 323i/328i, E39 528i/540i/M5, E38 740i/750iL, Z3 2.3/2.8

The most-common failure on an alternator can be replaced on its own, replacement for part #12311713491.

+ -
+ -
+ -
+ -
+ -
+ -
+ -
+ -

  •  

Price:
$434.31

This voltage regulator was used on the electrical charging system and installs on the backside of the alternator on the following BMW models: E46 323i/328i (1999-2000), E39 528i (1997-1998), 540i (1997-1998), E39 M5 (2000-2003), E38 740i/740iL (1995-1998), 750iL, Z3 2.3/2.8 models (1999-2000). 

Fitment Note: On 540/740i/740iL models, this regulator only fits cars built up to and including the 1998 model year. Not for 540i/740i V8 after 1998. 

Charging issues are not always a "bad alternator". The voltage regulator is located on the back of the Bosch alternator and it regulates the output voltage produced by the alternator. A bad voltage regulator can fail to charge the battery at a sufficient rate (slow drain) and it can also allow too much voltage to enter back into the rest of the electrical system where it may damage voltage-sensitive components. Rebuilt alternators will include a new, or tested and approved, voltage regulator. But if you believe the alternator is good, the regulator can be replaced on its own to avoid a bigger repair bill. 

Note: electrical parts cannot be returned once purchased. While this is often a good "first try" part for fixing bad alternator voltage issues, if this doesn't solve your issues you can't simply send it back. We can't take used/tested electrical components back as it's not fair to the next customer to get anything other than a new / tested unit. On the bright side, if you end up replacing the complete alternator, you'll already have a voltage regulator. 

Voltage regulators often vary by alternator brand and output. This one replaces the regulator on Bosch 90A, 120A, and 140A alternators used in the models below: 

BMW Fitments:
3 Series
E46 (99-05) > 323Ci
E46 (99-05) > 323i
E46 (99-05) > 328Ci
E46 (99-05) > 328i
5 Series
E39 (97-03) > 528i 99-00
E39 (97-03) > 540i
E39 (97-03) > M5 (00-03)
7 Series
E38 (95-01) > 740i
E38 (95-01) > 740iL
E38 (95-01) > 750iL
Z Series
E36/7 / E36/8 Z3 (96-02) > Z3 2.3
E36/7 / E36/8 Z3 (96-02) > Z3 2.8 99-00
Recently Viewed Products