It appears the DC output is unregulated. Regulator-rectifiers normally have a metal case to help sink heat.
The behavior you see is consistent with an unregulated alternator. The battery, if it was good and also properly connected, should suppress any spikes coming out of the alternator. It is quite normal to see big voltage spikes if there is no battery connected to the alternator, or if the battery is bad.
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Today's Featured Article - On the Road with Dave Gohl: Tractors and Farming - by Dave Gohl. I never thought I'd live to see the day, when I could call myself a farmer. What allows me to say this? Well, when our family moved to our 20 acre site near New Prague, Minnesota, I had one thought in mind. You guessed it, farm it somehow. A little history is in order. In my younger days, mom, dad and my brother made frequent visits to dad's youngest brother Pete, who took over the home farm from grandpa MIke. It was the typical set-up, milk cows, pigs & chickens. In the winter, we'd play
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