2001 ranger will not turn over
 

motor blew up in my 2001 ranger 2.3 5speed. Found a new one, I started it and heard it run b4 I pulled it. Put the new motor in my truck, turn the key and nothing happens. I have 11.7volts at the starter, if I jump the solenoid the starter motor turns over but does not engage the fly wheel. Any ideas as to what is going on?