I got my hands on a 71 ss chevelle dash i have a 70 malibu my car is a 350 tranny auto and 350 the car is a colum car . I bought a new wiring harness to replace the 71 harness for a 70 i need to now what does the wire that seems to go through the firewall go to and what is the best what to get it through. (remember my car is an a/c car). My other question is the is set of three wires that go to the very end of the harness the colors are a light blue an orange and a yellow they end up in a three prong female end if it helps thanks