In this next step we are going to have to do what most lego owners would hate to do, take them apart. What we have to do is cut one of your connecting cables in half. If you don't want to do it, either suck it up or order new ones at the lego site, here I'll even give you a linkhttp://shop.lego.com/Product/?p=8529
:) Ok, now strip off a good chunk of the black casing. You will see six wires under it. Cut off the four colorful ones but leave the black and white wires on the end.
Now string some of the casing off of them and either twist or tin the exposed wire. This opens loads of opportunities just waiting to happen.