I have a 68 camaro conv. The arrow in the dash that indicates that the turn singal is working will not blink when the lever is pull to the left. when pulled to the right it work fine. I have changed the blubs an I have changed the circuit board. but the problem is still there. I have a friend with a 68 coupe that has the same kind of problem. Is this a command problem? I am lost can you help me . Know else has been able to.