Turn indicator lights acting up

Any time the turn indicators come on with park lamps, the fault is ground at the front park/turn fixtures. I'll guess yours are pot metal fixtures with bulb socket crimped in. If so, the break in ground path can be anywhere between the bulb base to socket inside to the bolts holding the fixture to grille what ever. I've seen the path broken at that socket to fixture crimp also. Plastic fixtures have actual ground wires to the radiator support area.
If the ground fault was in the dash they wouldn't come on at all.