I'm a newbie with the 80 series as of 3/1, and have not received my factory manuals yet so please bear with me. Is it not possible to convert the corner parking light into a blinker by using a method shown on Daniel Stern's site, found here, by simply removing the corner marker ground wire and attaching to the blinker pulsed hot? Or is the 80's marker/blinker ground/power setup completely different?
I did that with my rear marker lights.
I would think it's possible. Try it out. The worst that could happen is a blown fuse.
You could also just swap the corner marker and blinker sockets, they are interchangeable. I, and several others, have done this.