Outdoor Power Equipment and Small Engines - Clutch will not enguage?

I have an airens ezr 1540 zero turn with 15 hsp koler engine. Today a wire jumped off of the clutch where it attaches at one of the clutch 's terminals. This has happened a few times in the past and I have attached it and continues running with no problems. Today nothing. I replaced the 2 terminals and wire going into clutch and it still will not enguage when I pull up on the blade enguage knob. In the past you could even hear a clicking sound if you pulled up on the knob when mower was not running..but nothing today. Does anyone know of anything that I might try to see if clutch is still good or something that I could look for or investigate further?
Thanks for any insight.
-John

Unplug the clutch, engage the clutch knob, and check for 12 volts across the wiring connector coming from the mower. If you have voltage there, then you have a clutch problem. If not, a wiring or switch problem. Post with results and we can go from there.