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Signs My Mercedes Alternator Is Bad

93 Comments / By / April 4, 2023

If you’ve clocked over 100,000 miles on your Mercedes odometer, the alternator may go bad sooner rather than later. This electrical system part generally lasts 100,000 miles or ten years. If you are having any of the problems listed below, it may be time for us to replace the alternator.

Burning Electricity

The alternator should never generate more than 14.5 volts of electricity when it is in operation. If it does, it can overheat your Mercedes’ electrical system. When this happens, you will smell burning electricity in the engine. In severe cases, you may end up with an electrical fire.

Electrical Problems

Other electrical problems include dim or overly bright lights or flickering lights. This is a sign that the alternator is providing too little, too much, or bursts of electricity, respectively. You may also notice a difference in how brightly the lights inside of your Mercedes shine.

Frequent Jump-starts

The alternator takes care of many things including keeping the battery charged. If you have had to jump-start the battery frequently to get your Mercedes started, it’s possible the battery is losing its charge and the alternator is not recharging it. This can also be a sign that the battery is dying.

Frequent Stalling

Your Mercedes will also stall frequently if the alternator can no longer send the spark plugs enough power for them to generate sparks. The plugs rely on electricity through their wires in order to produce the sparks that ignite the fuel and air found in each cylinder.

Growling Noises

The alternator may get verbal, if you will, when it is going bad. The alternator can grind or growl if it is wearing out. This points to a problem with the interior of the alternator. The alternator belt can also go bad. When this happens, you will hear whining in your Mercedes’ engine.

Slow Accessories

Another alternator problem that is easy to notice is slow accessories. The alternator provides power to your Mercedes’ accessories. If they slow down or start to act weird, this could be an indication that the alternator is too old and needs to be replaced with a new one.

Finally, your Mercedes’ engine control unit may turn on the battery light to let you know that the alternator is going bad. Take this dashboard warning seriously and drive straight to our shop. We are experts in European automobiles including Mercedes-Benz.

93 thoughts on “Signs My Mercedes Alternator Is Bad”

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