Bob M may have it right, electrical noise on an old point type ignition system will make a DVM read high. I saw that last summer while checking battery voltage on my Moline Big Mo 400 with stock point type ignition and 3 wire delco.
I checked charging voltage at the battery posts and was getting a very high and eratic reading with a digital volt meter, 17 +. That did not seem possible, as the ammeter reading was only about 5 amps at high rpm.I got my little chepo 50 amp battery load tester with the big analog voltmeter and connected it to the battery posts. It read a correct 14.5 volts. With the engine shut down, the DVM read the correct 12.6 volts, but aparently could not handle the noisy voltage signal from a running spark ignition tractor.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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