I have a 2005 CDI , that now has +200K km on it now.
It is always dry stored, and the alternator has never been a problem.
I do have a ScanGauge.
About 500 km ago, the voltage started to noticeably drop, usually 13.8 or 13.9 .
About 100 km ago The voltage was running 13.5 thru 13.7 .
Today It is running 13.1 thru 13.4 , and at one point it momentarily registered 12.8 .
None of the light are flickering , and the belt is not squealing.
Is this likely a symptom of a failing voltage regulator ?
Thanks for your suggestions , Will