1999 Chevy Tahoe I cant figure out what is wrong with my tr

As far as the tail lamps, did you check the proper wire for voltage??? The orange wire at the headlamp switch is hot/voltage all the time. That circuit is protected by the parklamps fuse, not only check the fuse, check for voltage on the circuit. Even if the fuse is good if there is no voltage, the circuit is dead. When you turn on the headlamp switch, the brown wire carries voltage to the tail lamps. I understand your frustration,but, if you take an attitude with me, I'm not going to put up with it. Have a good day.