how can i fix my lights on a vauxhall corsa?

Only a guess mind you from probs with my Sierra rear light cluster.
Check the terminal block on the light cluster if its the same set up as the Ford Sierra, a plug in block onto fingers/fins on the light cluster, that may need cleaning. The block should pull off and clean it with an fine file or if it fits a cardboard type fingernail file.

sorry can't be of any more use.
Bob.

Bob
December 2005