I agree with kennyd. It is the harness where the short harness plugs into when using the front hitch with front mount SB. There will be no voltage in this harness. It is actually a digital pulse signal that is sent by the PTO shaft sensor in the front hitch. As Kennyd said, this bypasses the need to use the RIO when backing up when the mid PTO is on.If it's up by the front axle, it's probably the RIO lockout for the front hitch what using the snowblower.
I can confirm this. I traced it in the tech manual out of curisosity when I was in there once.It is for the mower deck "Independent Lift" electric hydraulic valve. There will be no voltage on either of the pins unless you add the switch for the "Independent Lift". The switch would mount where the blank is in the lower left portion of the console. There will be also be a connector harness tail, with a connector shell, that would mate with the switch within the console.