I have an old Yale G51C with a flathead Continental 163 engine in it. We have been having an issue lately with the battery being dead if we don't keep a tender on it. The tender would always begin to charge immediately after plugging it in. This lead me to believe that either the battery was bad and not taking a charge or the alternator wasn't putting out enough juice to charge.
Today I tried the age old test. The battery was 13.2V with the lift off but if I started the engine it dropped to 8.5V and then slowly worked up to 10.2V. Reving the engine made no difference.
I have had cases before that the voltage stayed the same but never where it dropped.
Bad alternator?
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