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I have an issue with my '78 L-82.... my right directional blinkers stopped working a few days ago (as well as the brake light on that side), the lights go on when I turn on the headlights tho. To attempt to resolve, I installed new front & rear bulbs and a new flasher on the fuse box. I can't see any obvious wiring related issues...getting frustrated.
Also, check the connection between the light housing and the harness to make sure the contact area is clean. A little scraping/cleaning of the contacts got my right front blinker back in action.
I have cleaned the plugs for the right front blinker and I got the blinkers to work momentarily (both front and back were working again), now the front one just stays on... No obvious wire issues. I think I am very close...