So is c422/c421 the power line for the trailer harness? If so then, all you need is the 3 realys mentioned (left, right,park relays) and all should work?????
jpark said:If you did find the tow harness, is the flat, 4-pins-in-a-row harness, or is it the harness shown below?
Direct image link: http://i246.photobucket.com/albums/gg10 ... ailer2.jpg