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How I fixed my 1994 Pontiac Formula Firebird Tail lights
Drivers side turn flasher would not blink (cycle on-off).
When applying the brake one light would turn off.
Changing the flasher did not fix the problem.
I replaced the two bulb sockets on the drivers side and the flasher worked again.
How to test:
Take a multimeter and make sure the bulb socket is grounded.
If the socket is not grounded the socket ground wire has gone bad.
Bad ground wires on the bulb sockets. There are
three wires and the ground wires was broken on two sockets.