Observation:
Different part number on the Gold SD's regulator: 1 197 311 022
Green SD's regulator: 1 197 311 023

Not sure what is different.

Test results were much more encouraging:

Battery - Car Off - 12.42v
No GP Light On
Key On - Car Off - 11.42
Glow Plugs verified to be running, voltage @ GP #1 - 11.07v
Started Idling - 13.9v -
Started Revving - 14.02v peak
Only Blower High @ Idle - 12.90v
Only Blower High @ Rev - 13.80v
Blower High + Lights @ Idle - 12.12v
Blower High + Lights @ Rev - 13.60v
Blower High + Lights + Rear Defrost @ Idle - 11.74v
Blower High + Lights + Rear Defrost @ Rev - 13.00v
Blower High + Brights + Rear Defrost @ Idle - 11.66v
Blower High + Brights + Rear Defrost @ Rev - 13.04v (this number climbed gradually the longer I held the engine at higher rpm)

It looks like a new voltage regulator is in order. This seemed to have been the problem.

If you guys agree, I'll most likely keep this 022 regulator in the Green SD and buy a new one for the Gold SD.

If at all possible one that will put out more. If not I'll find a 022 regulator.

Let me know what you think.

A brief search on some parts websites turned up 1197311028 when I entered either part number the 022 and the 023

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