marc_schulz5

G Klasse reduced power and battery light

My 2001 Mercedes G Klasse with a gasoline engine is showing some worrying signs. I've noticed reduced engine power and the battery warning light is on. It struggles to start sometimes, and the lights are weak. Mileage is at 89257 km. Error memory shows generator faulty. Sounds like an alternator issue. Any ideas?

4 comment(s)

I had similar symptoms in my G Klasse. Check the serpentine belt for wear or slippage. A faulty belt can cause the alternator not to charge properly, leading to a battery low situation and eventually affecting the starter motor. Has the alternator been tested?

Thanks. I haven't checked the serpentine belt yet, I'll take a look. How can I determine if the alternator is actually defective? Is a multimeter sufficient?

Yes, a multimeter can be used to check the alternator's output voltage while the engine is running. However, for a definitive diagnosis, it is recommended to visit a workshop. They can perform a load test to assess its performance under stress. Defective generator is a probable cause.

Thanks for the advice. I took it to a workshop, and you were right. The generator was defective. Alternator replacement cost me 960€. Runs fine now.

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