Hold-In Coil
Connect jumper wires between a 12 volt battery and solenoid as shown in Fig 1, at the same time, press the armature into the solenoid by hand. The armature should remain held-in. Disconnect jumper to terminal 50 and armature should immediately return to its outer position.
Do not attempt to repair solenoid. If it fails either test, replace it with a new one.