You can now insert the terminals into the new black power plug. They will only insert into the black housing one way, so if it feels like it is not going in fairly smoothly, rotate the wire. The clips that stick out of the sides of the metal clip will face the side you see in Pic 1.

Note that the black wire goes into the position next to the tab and the red wire goes on the opposite side! Polarity is important!

Insert the terminals fully into the plug as shown in Pic 3.