its pretty easy,
the plug going into the transformer should resemble a butterfly, that is
the upper right corner will be black, upper left will be white(if white is in center relocate it)
you will need to take the third wire, which will be going from the bottem left corner to the bottom right corner, move the bottom left corner wire to the middle right,(forming a loop on the right side)
you will need 3 inches of 18guage wire , 2 .93 FEMALE molex pins a crimper to make the jumper, and a pin extractor(radio shack does carry these items)
the jumper you make will be inserted into the left middle and bottom holes,
forming the butterfly! , re-insert, change the fuse to a 8amp slo blo, and done