Assuming Lucas Alternator. Four things make that happen. Diode rectifier bridge in the alt goes bad such that they let current pass through in both directions letting the battery discharge through the diode pack to ground (earth). The battery can pass hundreds of amps, smoking the wire. The wire could have been corroded internally letting it heat up when charging current passes through it. Eventually it heats and smokes the insulation. Hooking the battery backwards, or jumping the system with wrong polarity to ground (earth) The alternator is not being regulated correctly and trying to charge radical amounts of volts. the battery can be overcharged and ruined by this as well as too many amps flowing in the wire. Two recommendations. Take the alt to a shop and have it tested. Next use a fuse link in the connection to the alternator they are a modest sized colored wire rated for 10 amps more than the alt puts out. These are available in auto parts stores. They are cheap and easy to install. It is a fuse to protect the alternator. Jim
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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