ok i finally was able to remove the hosuings for the cab lights, cleaned around the base, had 2 bulbs that were out, got new bulbs, now only 1 lights up??? contacts inside where the bulb go's looks good and clean... cant get to the base mount screws unless i remove the headlinner,. any ideas why i have only the center light working??? also were these add on cab lights wired into the light switch attached to what side???