96 z71 Help

I picked a 96 Chevy z71 for hunting and have Been trying to figure out blinkers n flashers. When I turn on the key they work for 5-6 flashes and then stop and won’t work again unless I turn the key off and back on. I replaced the flasher relay under the dash as well as the tail light assemblies. Any idea what else it could be before I venture into replacing the whole multifunction switch? I’ll also add that everything else on the switch works as well as brake lights and all running lights.

Check for short at back end maybe trailer pigtail

Interesting.

Update: I replaced the flasher relay under the dash and all blinkers work, however when I was driving it around the relay began making a weird buzzing noise. Guess Im going to have to dive into the wiring at some point. I will check the trailer wirng and see if the buzzing continues.
It will work for a lease rig, but wouldnt mind being able to drive it on the road to check cows or run to the store.