I used this:
basically, I used a flathead to pry it out. Then, I unplugged it. Then I went to the trunk to see where the hole was that the cord came thought. Then, I yanked the cord out. I plugged in the new one. I had my son sit in the trunk and look for the new wire. (This was the hardest part getting it to the hole.) Once he saw the loop of the wire at the hole, he used a steak Knife to grab it and pull it through. Done!