brake electrical circuit diagram to troubleshoot or help fixing light problem.

What is your question?

during the daytime brake lights work the way they are supposed to work when the brake is applied. at night when running lights are on, the right (passenger) rear brake light goes out when brake is applied and comes back on after the brake is released. would like to have an electrical diagram or help with why this happens so as to trouble shoot and fix the problem.

What makes this problem better or worse?

day light

How long has your 2000 Saturn LS1 had this problem?

sometime