I remember that I was opening my truncheons the tail lights flashed and then have been on the entire time. I even have the brake pedal switch unplugged and the brake lights are still onI would start at the switch myself unless you have been doing anything in the trunk area. The harness goes down the drivers side of the trunk and is normally tucked up out of the way but it not impossible that it has fallen down or got pinched somewhere.
Sorry. I open my trunk and .....ahhhh. well wtf is a truncheons?