1994 Ford Ranger Starter will not shut off

I am having a problem with my Ranger. Everytime I start it, the starter will keep running and will not shut off unless I remove the negative battery terminal.
I have already tested the wire that goes to the S terminal on the solenoid and it was good. The solenoid is also brand new.
Could someone show me how the solenoid is supposed to be hooked up that way I know for sure it is right?
I also read that someone else has the same problem as me and a CarPro guy also suggests that the flywheel could be warped. I really hope that isn't the case.
It would be greatly apreciated for any other reasons as to why this keeps happening.
By the way, I am on my third starter.