Mercedes Vito W639 113CDI - U0106 Code related to alternator ripple?

Hi guys, in Australia struggling with this one i think i am on the money but want to prove it!
U0106 lost communication with glow plug control unit, we have tested all feeds to the glow plug control unit and they are fine. Tested CAN OK.
Found that on the LIN the control module and the alternator are linked
 I have a picture of the diagram showing the link, and my alternator ripple test....first time poster just working out how to upload hopefuly it has attached 

I have confidence in the wiring, now i am torn between the glow module and the alternator, 0 symptons on the car just a CEL

Your AC Ripple capture looks perfect in my Opinion. <100mV.  All the tails and humps look very even and no repetitive anomalies are present.

Remember there are three positive and three negative diodes, so follow your ripple "humps" in 3's.  Your good!

What you have circled in red (those big spikes) is the internal regulator in the Alternator Switching as the PCM controls it's output via the Lin Bus.

You can test this by adding various loads and you'll notice those spikes will coincide with loads being turned  on or off.

 

Just as Paul stated: there is no obvious problem to be seen in your capture.

Thankyou, that helps me not do an alternator
Here in australia we don't have access to the workshop manuals from the manufacturer, we can rent them for a time period...which i tried to do however merc wont release it until I am EV accredditted even though this is not an electric vehicle!!
Any suggestions as to what I could chase next in relation to this code, I am confident in my wiring I just can't determine do i have fault in my ECU or Glow plug control module ?

Which module flags the U0106 coded, Is It the EDU? If so, this module is not causing the DTC and probably NOT at fault.
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Is this a hard code or an intermittent one? If the latter: can you reproduce it?

I would look at powers, grounds and the com lines of the glow plug controller while making/waiting for the failure to occur. May be even the current consumption when activating the glow plugs.

Are there any related driveability concerns?

Thanks mate, the fault is logged in the ECM
The fault is permanent
The glow plug module is outputting to the glow plugs and all glow plugs have been powered individually and there amperage is the same
I have had multiple people tell me that ripple is bad so am very confused.

If the fault is permanent, (and sets with the engine off), then it isn't going to be alternator related.