[Al Skierkiewicz]

Two things. WildStang uses the crimp on connectors and while lacking a tool, a vise is an alternative. Place the connector in the corner of the jaw at a 45 degree angle with only about half of the connector in the jaw. Compress enough to hold the wire in place. Remove the connecter and then rotate 180 degrees and repeat. The result is a compressed terminal that show a nice "X". We follow that with solder to insure low resistance. As pointed out, only a minimum of solder. Add the solder from the mounting side of the connector and watch for solder at the wire end. You see no solder flowing if you do this right.
As to the screw type terminals, the greatest failing is too little stripped wire. These terminals work best when enough wire is protruding from the mounting side of the connector. When the screw is tightened, the wire should be a larger diameter outside the connector on both sides of the crimping body. Installers trying to make a nice looking terminal will not push the wire through the terminal and when tightened wire will eventually be pushed out the back of terminal like a banana from a peel.