Looks like the PTO switch controls the negative/ground And the positive is constant to the PTO from the R terminal, also supplies pos to the rev switch that's in series with the coil of the relay. Always cool to see the different variations that are out there. Good luck with it Larry. Nice pick up
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(2) Original, 100, 102, 124, 73, 800, #1 and #2 cart, brinly plows, disk, IH184, IH244, 1948 F Cub
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