"G.R. Patterson III" writes:



There's an easy test while in flight. Turn on some load - the landing
lights will do nicely. The zero-center battery gauge should stay
the same, ...

Actually, there is a short deflection to the right, lasting less than a second, after
which the needle centers again. I use this test during runup to simultaneously check
the ammeter and the lights.

True, but it may not be visible in all cases.






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