Audi cabrio return light spins

Hello first of all, I am in despair, I have a convertible of 91 , 2,3e with switch gear. I had the clutch made some time ago and since then my return driving lights did not go any more. I have already repaired the wire harness in the tailgate and the switch on the gearbox has come in new, now the return driving lights only go on if I move the switch lever to the left direction first gear but if I move it to the right direction backward gear does not do anything…. I’m straight with my Latin at the end concerning the errors …. Would be really great if with one here in the forum could help further!