hi there i have a 90 z71 and i have a problem with the parking lamps and blinkers.
when i turn on the left blinker both the lesft and right blinkers go off just like if i hd the hazards on. and when i turn on the parking lamps on the left blinker comes on and stays on. if some on could please help.

 

sounds like a bad socket...try wiggling the bulbs around in em and see if ya find it