Windlass Solenoid problem ?

[Quandary]

The Southern Pacific windlass on our boat was unreliable, sometimes only working in one direction or not at all, I suspected the switch and tried to take it out but the plastic bolt on the back was not for shifting. I resorted to tearing the three wires out of the switch and by touching them together the windlass ran so established that the problem was at the switch, I had to break it in pieces to lever it out, then fitted a new 3 terminal Lofrans switch in its place. However when I operate it the solenoid gives a loud click but nothing else happens. I checked the voltage at the battery 13.6 or 7 and at the solenoid it was still about 13.4. Seems odd that the solenoid should fail just because I had cleaned the contacts and replaced the switch.
So what does an electrical numpty do next, buy a new solenoid or is there somewhere else to look first?

 

[lpdsn]

It does seem strange but the voltage drop implies some current is flowing.

Is it a sealed unit? My contactor unit off a Quick windlass is. Does it behave differently when you try up and down? If not, and assuming one fault that would imply something with is up with the common wiring between contactor unit and motor.* Are you getting any voltage there?

*I'm also assuming two way motor.