My rear running lights stopped working. Brake and turn are good. I replaced the head light switch and turn signal switch already. My backup lights stopped working too. I can't figure it out
I can't second this enough. I went round and round with a similar problem for far to long. Turned out the PO used single filament bulbs.Just might be the bulbs, odd as that might seem that just the filaments for the running lights went bad at the same time. One other possiblity - single filament bulbs where the two contact (two filaments) go.