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 - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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