do not cut any thing, use a fuse jumper/ doubler from an auto parts store ~$5 and then use that to sodder in your relay (take one side of fuse plug and run that to the NC relay (and to the switch), then back from the output side of the NC relay back to the fuse holder (put an inline fuse some place in there). take the other side of the switch to the contacts of the relay. the other side of the relay goes to ground. that what I did for my brothers Kia soul.
http://ecomodder.com/forum/showthrea...elp-22975.html