some light on odd electric issue

[mbodak]

thank you so much for that insight...my wife and i do appreciate an informed source helping us understand our 337 issue..we have owned this same 337 for 12 years now....could you please explain the run/stby system a little.....when this odd electric issue, of no charging of our battery, would show itself...we could, by selecting "stby", establish charging again but.. only if we turned the master switch off too...