I had my lights all in and working. After a couple of drives I have a problem. The signals don't work. No matter which way you move the lever you get the front two alternating and the two in the dash going together. The back seems fine. I think this started after I tested the 4 ways. I can't be sure. It is a 66 with all new lights. Could it be a bad ground? What else should I check? Should I check in the front or the back? Could it be under the dash? I just don't know, HELP!