im having an odd issue with my 1989 camaro rs front turn signals work till the headlights are engaged once the headlights are on the turn signals stay solid no flashing on either side i recently replaced the original turn signal sockets with aftermarket dorman turn signal sockets and the turn signal flasher has also been replaced went over the wiring everything is good just no flashing when headlights are engaged hope someone has had a similar issue with there third gen on here and can give me some insight thank you

 

Not particularly thirdgen specific, fortunately.

Does it malfunction also if you turn on just the parking lights w no headlights?

 

yes just tested it yesterday same results with park lights engaged