Looking for help on the '48 clamshell Burb (guide r-13) taillamp. I've had the truck rewired with Classic Harness but didn't have the tail lamp done at that time. The tail light works but cannot figure out the stop lamp. I have four wires to the rear (two purple, white and a reddish if I remember correctly)They are not numbered in the back and I am currently unable to crawl under and look.I know a lot of you guys have used this harness, any suggestions?