I am having trouble getting the dash lights going in my 63' galaxie 500.... Checked the fuses... All ok.... Changed all the bulbs Out... Was wondering if they have to be in the light sockets to work so they have ground??? Maybe that's my problem??? Also read where there may be corrosion on the switch and I was gonna remove and try to refurb it... Any insight as to removal and what to look for??? All help welcomed and appreciated... Thanks in advance.