I think Karma is punishing you because you downright "stoled" those tractors and attachments! Even if only 1 of the two tractors works, you've got a good parts tractor to keep the one running...
I don't know the old models (and just barely understand the new ones) but I'm sure someone experienced with that vintage will be along shortly to help.
If you're saying the tractor won't even turn over without jumper cables I'd suspect a bad battery, but that seems sort of obvious so I assume you mean something else (will turn over with own battery but no spark at plug unless jumped?) which is a little more mysterious...
I don't know the old models (and just barely understand the new ones) but I'm sure someone experienced with that vintage will be along shortly to help.
If you're saying the tractor won't even turn over without jumper cables I'd suspect a bad battery, but that seems sort of obvious so I assume you mean something else (will turn over with own battery but no spark at plug unless jumped?) which is a little more mysterious...