CUBCADETPARTSNMORE.COM has the schematic for your tractor, I just downloaded it and made a copy. It looks like you do not have the purple wire like I did on my pto switch. You have a brown wire that goes to your reverse switch then it continues to the seat switch and a brown return wire to the reverse relay that grounds out when the relay energizes. Check the black wire at the reverse relay to make sure it shows a ground to the frame. I would also check for continuity in the brown wire from the pto switch all the way to the reverse relay.
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