ALREADY CHANGED BULBS & CHECK FUSES
HOW TO FIX BACK RUNNING LIGHTS? ALL OTHER LIGHTS WORK. on 2006 Acura TSX
check for power and ground at the sockets
If you've got no parking lights and no license plate lights , check along harness where it routes along the trunk hinge (you will have to remove the covering) volt-ohmmeter will be helpful. Check for ground AND battery voltage.