So last night the wife and I were out with some friends, and they told me i had no tail lights. I checked and I have brake lights and turn signals and backup lights, but no running lights or tag lights. Dash lights are still working and even dim with the switch. Fuses look good (all of them, I checked all of them). I did put a backup lamp in the left side yesterday and just for giggles pulled the ground off and cleaned it up a little more than I did before (can't think a clean ground would be the issue but hey you never know). I'm going to get new bulbs here shortly cause the ones in it were sketchy at best, but worked. Checked everything with amber bulbs last night and it didn't make a difference on what worked and what didn't. Any help would be appreciated, I am going to check the plug under the bed here shortly. Could the multi switch, brake light switch, or headlight switch be the culprit as well? Thanks.
1990 MJ Sport Truck. 4.0L 5spd 2wd