I have a 1992 Chevy Silverado K1500 5.7L when I turn on the right or left turn signal both signal flash in the rear. Front ones work fine. The signal one will be bright and the other one is dim. I replaced the flasher relay. Does anyone have any ideas?

 

Check the wire harness going to the rear of the truck all the way to each light for a damaged section. There is a short somewhere in that wiring.