If your 2 wires in the same plug are red and black one is probably DC charging wire and the other is an AC output for lights. I forget which is which. You can look for a diode in one of the wires but you will probably have to remove the cover and you may have to remove the flywheel. The wire with the diode will be DC to charge the battery.
If both wires were the same color they would both be AC and plug into a regulator which would mount on the engine. The output from the regulator would be DC of course.
The other black wire is the ground wire to the magneto.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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