I installed a power amp in my daughters 2001 Celica. Now when she turns the headlights on the radio and center console lights go off. I have checked grounds and all other connections and can find nothing connected wrong. I have seen that the negative and positve dimmer wires become hot (12 volts) when the light switch is turned on. She said it worked fine before. The dash dimmer lights stay on and work like they should. Any suggestions? Thanks, jt