The front turn signals may need to be installed for the blinkers to work correctly. The housings ground out on the valance. For years I had a fiberglass valance on my car and I had to run a ground wire from the signals to the core support to get the turn signals to work.
Other things to check would be the ground straps from the tail light housing to the bumper bracket and the condition of your bulb sockets.
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Ken
'68 GTO - Ram Air II 464 - 236/242 roller - 9.5” TSP converter - Moser 3.55 Truetrac ( build thread | walk around)
'95 Comp T/A #6 M6 - bone stock ( pics)
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