Ammeter failure?

[Ross Statham]

On 1/16/2021 at 5:08 PM, zaitcev said:

I have a 69 E with a dead ammeter too, in a block of Rochester gauges. I heard from someone that it's fairly easy to clean them. and most likely the coils of the metering unit itself are fine, just the needle is stuck. But I never got around to taking the Rochester block apart, even though I have an old upright windshield and a hatch.

Spot on.  I used to own a Cessna 150 (named “Lulu”) years ago, and I had an A&P at KGVL where I was based tell me this trick. It works very well.  Cheap, simple fix.