Why in the world would you hook the two positive terminals up, and then you put 1 side of the wire on the negative and the other on the car.... I dont get this. I would think that if you had them directly set up so 1 wire goes from negative to positive and the other wire goes from negative to positive also, it would drain the the jumping cars battery instantaneously. So I think thats why you hook it up to a metal part of the car, simply because you want the cricut you are creating to have some resistance. But I cant figure out for the life of me why it goes positive to positive.