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 - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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