Did you test the switch?? I'm judging this from your very first post...."One day I found that the tractor would not start....". The blown fuse was just an intermittent problem which got worse and maybe the switch was failing. Disconnect the wires from the switch and test it. If ok, then start testing the wires and follow it. Better to do this disconnected from switch. Find the one that may have continuity to ground and follow along it. Keep in mind, one wire goes to the switch as ground from headlights as per schematic. Let's start with this for now.
As for buying a new wiring harness..... You could very well blow $180 and find out that it didn't solve your problem.
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Two 125's and a 124 all with 42" decks
Plow blade
#2 Cart
QA36 snowthower
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