Hi, my brother has a 684 and the Lucas alternator quit on it several years and I was able to fix it by repair the ground that contacts the opposite end of the drive shaft from the drive pulley. I just cannot recall exactly what the repair was but it did involve either brazing the end of the shaft or the strip of metal that contacted the shaft. This metal strip provided the ground for the rotor and without the ground the alternator would not charge.
A few years later the Lucas died again and my brother went to local auto scrap yard and bought a Delco. He had to buy a longer fan belt and the guard over the alternator pulley no longer fit. It was did the same to his 454 and 495.
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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