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Early Oliver Super 55 diesel Wiring

I was looking at the wiring diagram in the repair manual for the pedal start Super 55s, as compared to the key start Super 55s. The drawings show only two connections on the voltage regulator, L (Load) and B (Battery). The key start have 3 connections the third being field. Right now, my tractor is wired like a key start. Can I just remove the third terminal connection? My wiring harness has a red and green wire with the green going to load terminal from the light switch, and a red going to the battery terminal. I will attach the wiring diagram. Anyone else have an early diesel Super 55 they can send a picture of the regulator?






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