48 Volts sounds like induced interference (spark plugs-wires) or a problem within the multimeter. Got an old Simpson analog? You have to have a mechanism to develop a voltage of that magnitude from an otherwise unregulated 16 DCV source. I don't see that happening with a pair of diodes (or even a 4 diode FW bridge rectifier) and a transformer....too few parts for doubling, tripling.
I find sealed batteries tolerate overvoltages better than the old style with caps/plugs. My generator is on LP, starts quickly, runs once per week for 15 minutes, is regulated and puts out at around 14.5 and with the old style batteries I had venting. Replaced with a sealed battery and that was that.....just a lot of charging for the limited weekly starting power consumed.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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