Every morning I can't start my SUV. I must invite jumping. 5-6 times I brought it in auto shops,
where nobody can repair it longer than for 1-2 days. Nobody knows why the battery drains.
Who knows???

 

Hello and welcome to the forum! Have you tried pulling the car's codes to see what comes up? This should give you a good idea as to where the issues are coming from. Make sure to use a Mercedes scan tool, similar to the link below. Please let us know if you have any other questions.

https://www.pelicanparts.com/catalog...STGEN1_pg4.htm

 

You need to do a parasitic test with a voltmeter on each of your fuses in the fusebox to see what is drawing power. Do a search on youtube "parasitic test" for details.