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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!
 

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I'd disconnect the emergency flashers, what you call the 4-way, and see if they work correctly again. If so, then the problem is clearly in the emergency flasher unit.
 

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Had the same thing on my 69....destroyed ground wire for the front lights.
 
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