Battery alternator visit workshop is flashing on

Hi
It sounds to me like it could be a glow plug fault !
The glow plugs heat the diesel before it combusts. An easy way to diagnose this is check your exhaust after cranking on a cold morning if you have thick white smoke then you've probably got a glow plug down on 1 of your cylinders or maybe more
Hope this helps Nick

Your battery are okay but you may have an alternator/generator problem, it's not charging back electricity to the battery. That's the common interpretation of that battery warning light on the dash...

YOU NEED TO ERASE TROUBLE CODE WITH A CODE SCANNER.IF CODE HAS BEEN ERASED AND WARNING LIGHT STILL APPEAR MAKE SURE ALTERNATOR BATTERY POWER FEED WIRE AND CHECK WIRE COMING FRONT SAM CONTROL MODULE WITH FUSE AND RELAY MAKE SURE WIRE IN PLACE TIGHT NOT DAMAGED. CHECK MAIN FUSE IN FUSE BOX THAT SEND POWER TO STARTER AND ALTERNATOR.

The auxiliary battery needs to be replaced. It's a smaller battery than the one you have in your trunk. If you take it to your dealer to have it checked out it will run around $300 to change, and on top of it they charged me $50 to diagnose the problem.

I had a red lettering and a visit workshop msg with a battery symbol above. Mb book said for this message to check belt or alternator. Belt good so I checked in at the mb dealership thinking I had an alternator problem.When I checked in he said it was probably a secondary battery because it was in red. In blue it would be primary battery. Did not go back and check mb book but i don;t think that was in the book. anyway $345 (which i thought was very excessive) later i was out with a new? secondary battery and the light out,

Switch ignition on
Press trip counter button twice
Switch ignition off
Press and hold trip button while switching ignition on
After 10 seconds new service interval will be displayed +beep
Release trip button
Switch ignition off

You must check max voltage output on alternator, the cars electrical sysyem is prone to damage if regulary overcharged as this effects nearly all the sensors and management componants.

I had the same problem in me 2004 cdi e270. Check the voltage going to the battery when the car engine is on. Stedy charge of 12v should be going in to the battery, if the voltage is volitale say between 11v to 14v then it your Regulator (which is attached to the backend of the alternator). You need to change alternator and then unplug all the batteries over night and re plug them back again. The problem should go away.

Tighten the alternator belt.

or could possible be the alternator over charging