1993 F-150 solenoid is clicking but no start

I go to start it and the solenoid is clicking but the starter won't make a noise or anything. Replaced ignition switch and the whole steering column. Everything electrical (windows, wipers, blinkers, etc.) Is working. Battery is good. Starter is good I think. Alternator is good. The solenoid (it is located on the passenger fender) has 2 bolt things on it and the one closest to the battery shows 12.5 volts before I turn the key. The other bolt thing says 0 volts. When I turn the key all the way to start the enging the bolt thing closest to the battery shows 0 and the one closest to the cab of the truck shows 12.5 volts. I have replaced to solenoid 3 times today and it does the same thing every time except the last time the solenoids bolt closest to the the battery was showing 0 and the one closest to the cab was showing 12.5 and they reversed when I turned the key all the way. I have no clue and would appreciate any help at all. Thank you.