ok, here is a preliminary test. get an ohm meter aka continuity tester, unplug the solenoid from it's plug style connector. Look inside connector and you will see metal contacts or prongs. Plug your continuity tester leads on the metal prongs. continuity should be complete , another test that can be performed is to connect a 12volt power source up to the solenoid.......this will cause the mechanism to operate and the solenoid will "click" and do it's thing. good luck