I needed to sand it bad, took it out from inner dash. If you disconnect battery and prod the plus (center dot) with screwdriver till it is metal again and no corrosion it will work, atleast that was my problem. Can be done without removing lighter, is a slight pain but if you want to see what you are doing or make sure this is your problem and you have the spare time, you can take it out. If this is corroded, I suggest to take out the roof light also. Quite easy. Anything white is non conducting corrosion.