I can guess at why the coil melted down and so much current flowed through the points -
Chances are the coil should have had a resistor or a resistance wire in series from the battery source, so without the resistance to limit the current in the coil windings to a safe value, the heat generated started to cook the insulation off the copper wires inside. The coil has layers of copper wire with thin insulation. If the wire gets too hot the insulation fails and the layers of wire all start to progressively short to each other and what you end up with is nearly a direct short from one coil terminal to the other. Then your battery is effectively connected almost directly to the points and when they close enough current flows to melt wires and get the points hot also. Lucky it didn't catch fire.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
... [Read Article]
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