[randywebb]

OK that kind of a click.... The soenoid will make a bigger click...

So there is no click from the rear ---> almost certain that the solenoid is not moving. Likely due to resistance. So do the gnd strap first and report back. You may just want to get a new one. Be sure to clean up both areas where it mounts - you can use a dielectric grease on all contact surfaces.

The votage drop test is not real reliable - the problem is how much current can flow -- remember you can a nice voltage with current flow of micro-amps, but you can't move chunks of metal around with that much current.