One day my powerfold deck failed to operate.  (930 D2 Hopper)  Figured no 12V getting to lift motor.  Fuses in fuse panel OK.  So I checked 'T' connector under seat and one of the two leads on it seemed loose.  Using long nose pliers, I carefully compressed female fitting, reinserted male fitting, trouble cleared.  So I removed both of them, applied thin film of vaseline petroleum jelly on male lugs, reinserted.  Trouble never returned.