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Bosch Voltage Regulator | F00M144146

Mercedes E320, SL500, S500, E55 AMG, E500, CLK320, S430, CLK430, E430, SL55 AMG & more
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Leaves warehouse within 1-2 business days.

Make Sure It Fits

This unit is latest version used on numerous BOSCH alternators, please verify appearance and part number on existing unit prior to ordering. Replaces earlier versions F00M144138 and F00M145357 as well. Only for models with Bosch alternator.
Cross References:
  • 0031542506
  • 0031544906
  • 003154490605
  • 0031545106
  • 003154510664
  • 0031545406
  • 0031546506
  • A0031542506
  • A0031544906
  • A003154490605
  • A0031545106
  • A003154510664
  • A0031545406
  • A0031546506
  • F00M145357
  • W01331852913

Voltage regulators maintain a constant range of alternator voltage output and convert the alternate current (AC) produced by the alternator into the direct current (DC) the vehicle operates on. As the alternator turns, it uses coil windings and magnets to create the alternate current. The faster the alternator turns, the more current and voltage is produced. The voltage regulator uses diodes to convert the AC to DC, limiting the alternator's voltage output to 12-14 volts.

Voltage regulators fail when they can no longer convert alternate current to direct current or when they can no longer maintain a consistent voltage that the Mercedes requires to operate.

Signs of a faulty voltage regulator include:
  • Surging lights
  • Flickering interior lights
  • Instrument cluster or panel malfunctioning
  • Battery light or check engine light illuminated
  • A battery not being charged

Checking battery voltage or alternator output are simple ways to test a voltage regulator. Fluctuating battery voltage or drops in alternator output when the engine is at idle indicates the voltage regulator has failed and is not regulating voltage or not converting alternate current to direct current.

Replacing Your Mercedes Voltage Regulator

Some voltage regulators are external to the alternator and can be removed and replaced in series with the alternator output circuit. Other voltage regulators are mounted inside of the alternator and may be removable and replaceable, but some will require the replacement of the alternator to replace the voltage regulator.

View more Mercedes Voltage Regulators.

Bosch is the world's largest supplier of components to the automotive industry. The Bosch product line includes alternators & starters, brakes, electronic controls and sensors, fuel system parts and management, ignition system components, and steering system components. All Bosch automotive parts are either OEM (Original Equipment Manufacturer) or made to their specs as a replacement part for the OEM unit.
Left = Driver side and Right = Passenger side.
All parts are priced individually unless identified as a set or kit. "Per car" notes identify how many of a given part your car has and "Left/Right or Front/Rear" notes means the part fits the left or right side of the car. These parts are still sold individually and you'll need to select the appropriate quantity if you plan to replace more than one of this item.

Frequently Viewed Together

We found 10 additional part(s) that are frequently viewed together.

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What This Bosch Voltage Regulator Fits?

Application information below is for reference only and should not be used to determine the exact vehicle fitment. Please use the "Make Sure It Fits" vehicle selection box above to determine the exact fitment and review any application notes. If you need any help determining if this part works with your vehicle, please don't hesitate to contact us.

00-06 - CL500
01-06 - CL55 AMG
99-02 - CLK320
99-02 - CLK430
01-02 - CLK55 AMG
06-06 - CLS500
06-06 - CLS55 AMG
03-05 - E320 Base, 4Matic
98-02 - E320
For models with chassis serial number from B080432, F180103 or T091961.
98-02 - E320 4Matic
For models with chassis serial number from F180103 or T091961.
02-02 - E430
03-06 - E500 Base, 4Matic
02-06 - E55 AMG
02-08 - G500
03-04 - G55 AMG
06-06 - S350
00-06 - S430 Base, 4Matic
02-06 - S500 Base, 4Matic
01-06 - S55 AMG Base, Kompressor