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If everything is right, with an electric clutch, you should hear it pop in and out with the engine off, and everything hooked up right as you pull the switch.
I imagine you have a bad switch or wire somewhere. For test purposes, there is no reason why you can't jump the seat switch (not to leave it that way, of course) and override that for a few minutes while you are testing.
I think if I reversed the pto wire connector around, I hear the pto engaging constantly, once I flip it back I don't hear anything clicking...from what I remember, more to come tonight when I test it again