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 - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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