Allis B wiring

You would probably do better by posting your question on the Allis forum rather than here. Or the "unofficial allis" site.

In any event the diagram decal that's probably on your battery box is likely the original B wiring. Your tractor has apparently been modified so those connections would not be correct. For instance, the B never had an alternator and was 6 volt positive ground. Yours is likely 12 volt negative ground. It may or may not have an external voltage regulator. You may also not be fully utilizing the original switchbox if at all. You may even have a solenoid pushbutton start, also not covered by the decal diagram. Distributor plus external coil vs. magneto is another variable in the wiring.

Original wiring harnesses are available but you really don't need one. Since you are not original anyway, it doesn't really matter. It would be a rather expensive convenience, I think. Plus you likely would have to add to it anyway. You can start by checking out the diagrams at this site (scroll around) for some information but yours may be pretty much a custom wiring job depending on the extent of alterations that were done in the past. In any event I would suggest you use 10 gage wire from the alternator main lug to the ammeter and thence to the battery. 12 gage for the rest would be more than enough with the exception, of course, of the battery cables themselves.

Rod