Battery aternator visit workshop

[philv]

Hi

Mercedes b180 cdi auto.
2006.

Bought car used.

ater a ew days the car battery went flat when not used for a day.
GEM got the car charged again.
But engine check light stayed on.

So got Battery replaced....all fine.

A week later...tonight the message pops up-
battery
alternator
visit workshop

It is a general battery/alternator/charging message.

But i am assuming it is the alternator.

But is it odd that there was no message before?
Or is it possible previous owner turned the message off?

I would have thought the message would have been popping up before the battery died?

[philv]

The voltage is around 11.6 with engine running.
12 with engine off.

[philv]

Is replacing the regulator a standard garage job?
Or does it require a specialist?

[philv]

As it is a bosch alternator.....would any boschesupplier eb abel to get it?

Or get it fixed via bosche service centre?

[philv]

If it is 12v engine off and 11.5v engine running.
And the battery/alternator/visit workshop light comes on.

Does that mean that the alternatorr is doing nothing and the battery will be flat in a couple of days running?

Or is it still doing something and ok to drive till fixed in a week or so?

[philv]

Must admit to being a little confused.
It seems that tne alternator not charging probably meant tne last battery died.

But it is a week later before a problem comes up after the new battery.

Is that badically a week of starting tne engine?
The battery would not have been used for anything else but engine starts.
And that is tne reason it took a week for tne problem to reoccur?