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 - Diagnosing Engine Difficulty - Diesel Tractors - by Staff. The following suggestions are listed for your assistance. You can make simple adjustments on your tractor that will improve its operation and save you the time and expense of hiring someone to do it for you. Always make one adjustment at a time, and if the adjustment made does not improve the condition, return to the original setting before proceeding to the next adjustment. Hard Starting Cold air temperatures. Insufficient fuel.
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