Hook up the battery one way or the other. Turn on the lights and/or ignition switch. If the ammeter needle moves to the RIGHT, you have it hooked up "wrong."
Even if you have it hooked up wrong you can't hurt anything. There are no polarity-dependent electronics on the tractor.
Apologize in advance, because the following does not answer your question EXACTLY as asked, but you need to hear this:
I agree with others. No need for 8V. You are just going to cause more problems than you think you're solving.
There's no safe way to fully charge an 8V battery with a battery charger.
You wouldn't need an 8V battery if you had decent battery cables and the generator was working. It's only a C123 engine. If the generator is working your starter is shot.
Either fix the 6V system or convert to 12V. 8V is a waste of time.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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