Ml500 (W163) 2003

It seems that my battery drains, but not always, I tested the battery and alternator, everything seems to be in order.
Original car battery is in the car.
It does not matter how cold it is outside, one degrees Celsius or 15.
Some were I saw that people were talking about some module for the electric seat?
The rear windshield wiper or heat do not work.

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MercedesMedic made a comment.
1 year 4 months ago

Sounds like you have parasitic draw. What it means is that one of the systems is not going to "sleep" when the car is turned off.

After 20 min or so after you turn off the car most systems turn off. In your case, something stays on.
To find the problem you will need multi meter and start checking for for excessive current draw.

Once you find it you will have to go from there. But at least you will know which system is draing the battery.

Do you have a multi meter?

 

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