I have a little wiring harness that went bad, it's about a foot long, goes from the brake light switch to a a connector on a huge bundle of wires by the knee bolster.
my brake lights didn't work on my 99 when I got it in november. It was 2 weeks later before I realized it, I wondered if my tahoe had a chmsl and what it looked like, that's when I noticed they didnt work.
I replaced the switch, thought all was fine and then had a guy almost rear end me last friday. I looked and they didnt work again. I bought another switch and noticed it would work when the switch was hanging down and I actuated it with a screwdriver, but wouldn't work if I attached it to the pedal. and it would change depending on where I moved the wires to.
I've got the wires zip-tied into a good position so the lights work every time but I'm going to try and buy or rebuild that little one foot harness.