clock/interior lighting '79 240D

I have lost power to the clock and interior
lights in car when the key is not on or the engine is running. When I start up everything
works fine. On the day that this occurred I had been working around the cluster and got old problems fixed (dimmer switch was dirty
and cleaned with contact cleaner, I also checked instrument bulbs carefully)Also replaced trunk light and had the ash tray out
cleaning it the same day. I do not recall knocking wires around. Any ideas ?? Thanks,
Dave