[Zeke]

FWIW, Early_S_Man always said use vinegar, distilled water and alcohol in that order. I don't remember exactly what he said about dielectric grease but IDT he was against it.

I think something in your fog lights has gone to ground. Did you meter the lamps individually to see if the resistance is the same on both? Have you metered the ground side of the socket with the installed lights off and the key on? Should show continuity to known ground but no voltage. Maybe a little phantom voltage. You can always check for current but watch out for amps. over 10 will blow your meter.