i have a 92 1/2 ton, just yesterday my night lights quite working, i have head lights brake lights and turn signals but tailights or the amber lights just above the front bumper, also no dashlights, there are no burnt fuses, and i test the switch for continuity, if i remember correctly i had continuity across the whole switch.. except for between the tab that the red wire hooks onto and the one that the brown wire hooks on to, i dunno where the brown wire goes to so i dunno, i dont have a mouse infestation so i dont think any dash wire have gotten chewed on, any suggestions of common corrosion spots or somethin i can do

Sounds like a bad switch, brown is running lights and red is 12V supply if I'm not mistaken.