Up until I replaced the heater core a couple days ago, all of the lights on and in my car worked fine, after I finished putting the dash back together I went for a drive and noticed as it was getting dark that my dash lights are not working. So I went home and grabbed my 12 v light tester and checked all of the fuses with the lights turned on and the ignition on. All of the fuses are good, so I took apart the dash and traced the wires back to the instrument cluster, everything seems good but still no dash lights??? Could somebody please help me with this? Thank you