I put everything back as it was, and decided to let the fault get worse so I could track it.

Heres what's happening now. Im getting the occasional stall at idle in gear. I get "Check battery charge" on the dash.

I connected a volt meter today accross the battery.

Get 12 not started.
13.1 idling
With all accesories on and idling it goes down to 11.6 after some driving.
Rev to 2000 rpm no accesories - between 13.2 and 13.5.

Battery sounds fine when starting, never goes flat.

Could this be the cause of all my problems ?

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1985 190E - Gone
1989 230E - Gone
1995 C200 - Gone
1993 280E 120000KM - Built like a brick, the best one yet