i got a 1988 gt and my left front turn signal ONLY works when my parking lights or headlights are OFF. will not work when the lights are on. tried replacing the bulb and socket neither one fixed it. can anyone help. thanks guys
Check out the driver's side front ground. It will be a single black wire bolted down the the top part of the radiator support just above the headlight cluster. If it breaks, you will get the same symptoms you are describing.