Check voltage at the battery posts with the charger connected and running. voltage must be 13.5V or higher to charge a 12V battery. Sounds like your old charger has weak or failed rectifiers, not too hard or expensive to replace. If it has button diodes, many tines the cheap connectors are not connecting with the button terminals. A cleaning and tightning of the contacts will sometimes be all that is needed to repair the charger. You need an ohmmeter to check the rectifiers for open or shorted condition.
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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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