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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