SOLVED: I need the ignition switch wiring color code for Nov 09, 2018Car Reverse Lights Wire Location: At Switch on Transmission Car Horn Wire (-): Blue Car Horn Wire Location: At Steering Column Harness Sorry friend, this is as far as i can go to tel you how to hot wire the ignition. But with the color codes you should be able to figure it out, Good luck and keep me posted. Need to know wire color codes for ignition key switch on yes ignition key switch was cut out and 6 wires are left exposed. I have a new Key switch and am now trying to connect the wires to the correct prongs/pins. I can supply you with a standard wiring diagram but that is not going to help you with identifying the terminals on the new switch.