Donald Royer wrote:

It has long since stopped bugging me and I now just consider it to be a
harmless quirk of my bird. Only once in the time that I have had the plane
was the warning real and it that case a check of the ampmeter immediately
indicated that the alternator was not charging. (the alternator field ground
wire had broken.) Incidently, the plane was based at LZU for about a year
when I first bought it. However, I am no longer in the Atlanta area.

You can never have too many field grounds. I have 3 on my Mooney. They
don't cost much and its an easy back up to make. People spend thousands
on back up vac systems but sometimes miss the opportunity to spend 5
minutes putting an extra ground wire from the alternator to the frame.

-Robert