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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On the very early pedal-start Super 55 diesels, the regulator setup was indeed a little different from the later key-start tractors.
Two-terminal regulators (Battery “B” and Load “L”) were used on the earliest models. The generator’s field circuit was internally controlled, so you didn’t see a separate external “F” (Field) terminal. That’s why your manual shows only two connections.
Three-terminal regulators (Battery “B,” Load “L,” and Field “F”) came in when Oliver moved to the key-start arrangement. These had the external field terminal, so the harness added the extra wire.
If your tractor is wired like the later key-start version, simply removing the wire from the “F” terminal won’t work unless your generator and regulator match as a pair. The regulator has to be the correct two-terminal style if you want to run it like the early diesel setup. If you currently have a three-terminal regulator installed, you’ll need to keep that field connection — otherwise the generator won’t charge correctly.
What to check:
Look at the tag on your voltage regulator. If it’s a 2-terminal regulator, keep only B and L hooked up.
If it’s a 3-terminal regulator, you need the field wire connected.
Make sure your generator matches the regulator type. Mixing a 3-terminal regulator with the early 2-wire harness (or vice versa) will cause charging issues.
So the short version: don’t just remove the third wire unless you also have the correct early 2-terminal regulator.