[Al Skierkiewicz]

Jones,
The wires in the photo are #22 or smaller. PWM wires are typically #24 or #26. Since you should have extra PWM cables in stock, simply cut one to length and strip about 1/8' of insulation. Twist the wire strands and tin the wire. Tinning is heating up the wire and applying just a bit of solder to it before you insert it in the circuit board. This operation keeps the strands together and allows you to insert it in the board. Then just insert the wire and touch it with a soldering pencil. When it is hot enough add a little solder to the joint and remove both the solder and soldering iron. You should be left with a joint as shown in the photo.