Voltage Regulator Replacement - C Class - W204 - Mercedes-Benz



Voltage Regulator Replacement - C Class - W204 - Mercedes-Benz


Voltage Regulator Replacement Time: 1 hour Tab: $80 Talent: 2 Tools: 13mm, 15mm deep sockets, Philips head screwdriver, floor jack,jack stands, wheel chocks, safety glasses, torque wrench Applicable Models: Mercedes-Benz C350 (2008-15) Mercedes-Benz GLK350 (2010-15) Parts Required: Voltage regulator Hot Tip: ALWAYS disconnect the battery before beginning Performance Gain: Car charges again Complementary Modification: Change drive belt The alternator charges the battery and provides your car with a constant source of electricity while the engine is running. The voltage regulator does just what it says: it regulates the voltage from the alternator. Your battery should read a little more than 12 volts with the engine off. Next check the voltage of your charging system under load, the voltage should be within 13.2: 14.5 volts d/c. To load, have the engine running at idle, turn on the headlights and the HVAC blower motor. Never disconnect a battery cable while the engine is running to test the alternator. You may cause damage to the alternator or other electrical components from the surge in amperage. If your battery appears to be leaking, then your voltage regulator has probably failed. The battery will usually only leak acid if it has been overcharged at a much higher voltage. If the voltage measured at the battery is more than 14.5 volts when the engine is running, then the voltage regulator is probably bad. If your battery has boiled over and has acid overflowing out the top, make sure that you clean up any spilled acid immediately. Dousing the area with a water and baking soda solution should help considerably to neutralize the acid, and prevent it from eating away at the metal. A fair amount of the time when there is an electrical problem with the charging system it is the voltage regulator. Yet people just swap out the entire alternator because it comes with a new voltage regulator included because it is easier, fixes the problem, and most people do not understand how an electrical system works on their car. If your electrical issues are caused by a faulty voltage regulator you can save yourself a lot of money by just replacing the defective part. You don't always need to change the alternator. Save some money and learn how to test and replace your voltage regulator here. Applies to: C350 (2007-14), SLK350 (2004-14), CLS350 (2004-14), CLK350 (2005-14), E350 (2005-14), S350 (2005-14), SL350 (2005-14), R350 (2006-14), ML350 (2006-14), Viano (2005-14), Sprinter (2006-14), CLC350 (2008-14), GLK350 (2008-12)

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