Im building the harness for a "no cut" installation of the KTP-4553u behind my factory HU. I've read, and searched for hours, perhaps I'm not searching correctly but other than knowing that I have to add 2 new wires to #2 and #13, I can't find any details. I haven't been able to find a pin out for the 70-6522, so I could use some help identifying where to add them. I also can't figure out which wires I need to connect them to out of the 71-6522. Any help would be greatly appreciated!