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Old 10-03-2016, 12:16 AM   #1
Fred S
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Join Date: Nov 2014
Location: Houston, TX
Posts: 137
Default Fluttering Ammeter

Does anyone know what causes an ammeter that used to have a steady needle, to start fluttering? A friend said I might have a bad ground somewhere. But everything seemed to be working ok electrically, so I switched it out with another ammeter, and it ran steady. I put the original back in, and the fluttering resumed.

My instrument panel is chrome, and the ammeter has what appears to be an aluminum trim ring attached to the instrument panel. The spare has a black trim ring and its body didn't really fit in the aluminum ring, but I temporarily jammed in the spare body, for the test.

The original ammeter doesn't feel hot at all, and my battery is staying charged, so things appear to be working, except for the flutter.

I did a search and read where Tom Wesenberg said putting a drop of heavy gear oil on the pivot points would help dampen flutter. I plan to try that, but what causes needle flutter to start all of the sudden, after it has always run steady in the past?
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