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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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