John, if its converter to 12 volt negative ground, jumping is similar to a car or truck POS to POS NEG to NEG and don't make the last connection near the battery top where explosive fumes can be present. Jumping a very weak battery with a good one poses some hazards including explosion if not done correctly and you sound inexperienced
HOWEVER if it reads 12 volts its approximately 50% discharged. As an electrical engineer I strongly suggest you first fill electrolyte to the proper level,,,,,,,,,,, CHARGE THE BATTERY AND HAVE A SHOP LOAD TEST IT,,,,,,,,,,Insure all battery cables and ground cable are good n tight and not corroded.
Checking electrolyte and charging the battery and having a shop test it is soooooooooo easy n cheap and I try it FIRST before jumping although sure jumping (if done correctly) may get you started
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil’s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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