Fixed that.
I bought this 782 off of Eric and managed to correct this problem. In order to understand well, you probably need to look at the wiring schematics for the tractor you have and understand how the pto relay works.
In essence, the problem with mine was not with the relay, but with the new wiring harness. I bought a new relay for mine, thinking that would fix the problem, but when it didn't, I started poking around.
The new relay recieves a constant 12 volts from the reverse lockout system. When the tractor is not in reverse, it sends 12 volts to the PTO relay. When you shift into reverse, it cuts out the 12 volts and knocks the PTO.
My relay was not recieving that constant 12 volts. The new relay has a post that is for the reverse lockout circuit, so I took a wire and ran it from the hot wire on the PTO switch to the relay. That fixed the problem. Runs fine. I am not sure if the old PTO relay works in the same fashion. It may be something worth looking at.
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