Parking lights and flashing is two separate circuits. Meaning one can work and not the other. Flasher relay doesn't operate the parking lights.
It sounds like someone installed the wrong bulbs in them, or the second filament burnt out and fell off. It should have 2 filaments. Should take 1157A.
Does your rail tail lights and side marker lights come on with the lights?
but the bulbs haven't been changed. and i did inspect them and the connections well enough to tell that it is only single filament bulbs and sockets with only a hot and ground wire to it.
my tail lights and side marker lights do work normal.
so this leaves me thinking maybe the flasher has gone bad, and i need to check, but there are allot of relays under there and i don't want to just start pulling them without knowing what one it is for sure.