dead dome lights

Just bought used 01 Ram 2500. The dome lights and the radio are both dead, Checked power at fuse box - none. No power to dome lights or memory power for radio. Jumped power from another circuit through memory power wire on radio. Radio now OK - dome lights worked properly for a while, but now don't shut off. Any ideas - do not want to spend a ton of money to have someone troubleshoot electrical. Does this have anything to do with the control module under dash that has buzzer and controls p/w, p/l, etc.?????? Please help.