[Rich72C10]

My vote is your turn signal switch. I have had a bear of a time with mine, though it wasn't ever my brake lights or at least not the problems like you are having.

I got a shorten tilt (I had a non-tilt column) last year from a now banned forum user. Straight off the bat the turn single wouldn't cancel... 20 minutes of tweaking I got that to work. Then after a few months I started to blow fuses, which did take out the brake lights and inside cab light. I think I might have been driving around for weeks before I noticed I didn't have brake lights. I still randomly turn on my cab light to see if the fuse has blown again!

I got a replacement from GMCsPaul that has the red hazard pull. Seems a bit of debate if the tilt had the red pull switch or black one (but GMCsPauls says it is correct for our trucks). Though it did have the half-moon original type connector, so no adapter was needed (I hate adapters). But this one wouldn't flash the brake lights, unless I was pushing in hard on the hazard switch. I was a little put off that GMCPauls wouldn't stand behind what they sold me, so that was $50 bucks down the drain.

So I got my 3rd one (again from GMCPauls), at least this time I was a pro getting it installed. Now everything to do with the signal switch is perfect! It even has a better feel when I engage the turn signals. I guess 3rd time's the charm!