2000 S80T6 Head Light Switch not working
 

After changing my battery the head light switch stopped working. When changing the battery I used a OBD power supply to power the ECU to keep the settings. When installing the OBD power supply I connected to the OBD and connected to the 12V power outlet on the dash. The trunk lights worked during the battery install. When the car starts the dash lights and head lights are dim and after a number of seconds the lights default to full power independent of the head light switch; any solutions or ideas?