Turn signals don’t work when headlights are on

67Dart273 said

Poor grounding at socket
Poor contacts in socket or contact pigtails mis-oriented rotationally (clocking)
Wrong bulbs in at least one socket or bulbs jammed in wrong "clocking" or shorted bulb

What usually causes this is that park/ tail power "feeds back" due to a problem and changes the circuit.

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I have the same issue on my Cuda, only affects the drivers signal lite. I have relamped and correctly clocked the bulbs. I have cleaned out the sockets as best as I can. When looking at the schematics I have trouble following the grounds for the park/turn signals. Are they in the housings themselves ? What switches over to ground when the lights are on and the turn signal is applied ? Oh and I have continuity to both contacts in the sockets. I wouldn not pull the cluster out definately in the housing.