Assuming you're talking about a letter series tractor or a Cub, so here's a smaller picture of an H4 magneto, which was the standard mag for the letter series. The J4 on the isn't much different.
Yours may be painted.
A battery ignition will have an external coil like Mike shows and old describes, with the one large wire from the coil to the center of the distributor cap. On the H/J4 mags the coil is internal, and that wire runs to the cap from the end of the other, more rectangular, cap on top of the mag.
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Today's Featured Article - Fabrication (Who Me? Make it myself?) - by Chris Pratt. First of all, what are the reasons for not fabricatin your own parts? Most judgements on what should be purchased rather than fabricated stem from: Originality - If the tractor restoration is to be 100% original, it is likely that you should spend the time and money to locate the component in the used or New-old-stock market. Since this can be extremely difficult, you may want to fabricate the item or purchase a modern replacement temporarily, but eventually, you s
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