I am no mechanic but suggest you rule out a bad battery and a common ground. For sure search the forums. Each of these problems have been solved for others. In example:
[I]
Here's the kicker, even though the switch was indeed bad, that wasn't what was causing the random BAS light. It's the fuse panel/headlight switch. My trusted sidekick (my 7 year old son) and I diagnosed a faulty connection at the fuse panel, specifically the number 2 fuse which is for the brake lights and cruise control. There's enough wiggle on that fuse for it to loose contact and cut off cruise and brake lights. We figured this out with the car running, my sons foot on the brake pedal, and me moving the fuse around. The further in you push the fuse, the worse the connection. It's the same if you wiggle in the upward position. I'm pretty confident fuses aren't meant to wiggle. So, i plan to remove the headlight switch and see if it can be saved or not.[/I

It has been a while but I seem to recall a loose wire at the upper rear of the engine block which tripped an intermittent Check Engine. Just securing it was the fix. My crank shaft position sensor gave me some odd performance issues on its way to failure. The fix was quick and cheap.

It will be fun again.