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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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