E350 not charging

[keith of kent]

2015 E350 71k miles
Whilst driving a schematic of a battery came up on the speedo display saying "Consult drivers manual". Tried to use the on screen handbook without success. Engine still running so drove 15miles home keeping an eye on the temparature gauge.
After a while Command shut down, otherwise driving as normal. Checked the battery voltage with multi meter 12v with engine off and 11.6 with it on although at that moment the coolant fan came on. Temp gauge still at 90 degrees.
Waiting for my Indy to call me back. No signs of anything amiss in the engine bay. When I restarted the engine the display message cleared but soon reappeared.
Have put the battery (which is a 3 year old Varta) on charge with my Accumate.
Sounds like the alternator?
The auxillary batery is about 2 years old also a Varta

 

[ALFAitalia]

Should be 12.6 with engine off......14 plus with engine running....dead alternator most likely.....but it could be lose connections or very poor grounding.

 

[keith of kent]

Once home I accessed the on line instruction manual which says it could be a faulty alternator or a broken V belt, and not to drive as the engine could overheat. Is the drive belt for the alternator separate for the one that drives the alternator? And on my return journey the air con was blowing cold as required