Sometimes my brake lights (all three) come on by themselves. Sometimes my L dash turn signal indicator comes on when I apply the brakes, but will clear if I adjust the turn signal switch position, and it always goes out when I take my foot off the brakes. The L turn indicator always works properly, even when braking.
On rare occasions my L marker lamps will be on with the engine and all lights shut off. I just had to recharge my battery because of this. I thought perhaps a bad ground on my trailer harness was causing this, but I just had that rewired, and it did not resolve the problem.
I've had this problem since I bought the Jeep several months ago. I have to wonder if I have more than one problem going on here?