The Napa ST-542 has "I" and "S" small terminals and is activated by ground not voltage. The "I" terminal is connected to the hot side of the ignition switch. The "S" terminal is connected to the push button starter on top of the transmission. Attached is a link to an article here on YT that gives a great explanation of doing a 12 volt conversion, and also a diagram of the different types of solenoids. Just because a solenoid has the same number of terminals does not make them all the same as the diagram shows.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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