After putting in the 12 to 21 pin radio harness in my car, I have tried two different radio's and the lights dont work on either of them. If you have the car's lights off the clock will stay lit up, but once you turn the lights on the clock goes out and none of the radios lights come on. What could this be?

 

I just ran into this same problem today. Did you ever figure out how to fix it or can anyone else help?