I have a 1975 F250 and am having problems with the dash lights. I pulled the instrument cluster and all the lights seem to be getting power but if I take a known good light and put it in one of the spots where the light isn't working it still doesn't work. I then noticed that all the black plugs have numbers on the back. Do certain numbers correspond to certain locations on the panel? If that is the case then i think mine might be all jumbled up. Any help is appreciated!