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Bosch Voltage Regulator | 05133774AA

Dodge Sprinter 2500, Sprinter 3500
Mercedes 190E, ML320, 300E, E300D, E500, 300CE, E420, 300TE, ML430, 400E & more
In Stock Status
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Leaves warehouse within 1-2 business days.

Make Sure It Fits

P/N: 05133774AA Bosch
Cross References:
  • 0021548506
  • 1197311213
  • 1987237077
  • 5246863
  • 70433010101
  • 9130518
  • 9162996
  • 9168496
  • A0021548506

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 vehicle 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 Vehicle's 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 Bosch 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

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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.

03-04 - Sprinter 2500
03-04 - Sprinter 3500
87-93 - 190E 2.3
from engine # 10-040724; Transmission Control Type: Manual
from engine # 12-089215; Transmission Control Type: Automatic
93-93 - 300CE
93-93 - 300E Base, 2.8
93-93 - 300TE
90-93 - 300TE 4Matic
from engine # 023096
92-93 - 400E
92-93 - 500E
93-93 - 600SL
95-95 - E300D
94-97 - E420
94-94 - E500
98-00 - ML320
03-03 - ML320
thru chassis # A 319542
99-00 - ML430
thru chassis # A 318686
00-00 - ML55 AMG
thru chassis # A 318686
94-95 - S350D
from engine # 603971-12-002387