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tomorrow i am going to a guy that has equipment to read out errors from the car. hope i wind out whats the problem...

Ok, is that unit the one that are controlling the charging? Tells the alternator to start charging? are there any way to force the charging to start?

The black sockets in the middle there, what is that unit for? https://imgshare.io/image/QelOd

Thanks, i was out checking that fuse, and it seems all ok there, no signs of heat there

hmm, but if that 225A fuse was burned, should there be same voltage on the B+ as the + in the fuse box?

and, are there a fuse in the fusebox that are for these two thin cables., or are they connected into the control unit in the fuse box?

can we ohm the two thin cables? what should the readings be?

we used the multimeter from cars ground next to the fuse box and to the B+ on alternator and there is same voltage there as on the + in the fuse box. we have followed the thin cables from alternator and up to top of engine where it is combined with several cables, all seems fine.

It has about 10V when i have only main battery that i have driven for a while without charging, when i switched on the second battery, it says 12.2V. Ground cable are OK, car starts with no problem. If there where a ground issue, should´t the car had problem running the starter?

Hi, i have a 2008 mb viano 2.2 4x4 that are not charging.. it has a 200A alternator. for some days ago i drove the car to the shops, all seems fine then, but on the way back i noticed that the red battery lamp was on, and as i assumed it was not charging. when i start the car the red battery...