Does anyone have any experience with the OBD cables for dash cams? We have purchased a dash cam and since the 12v outlet on our 2013 Traverse is always energized, the dash cam will not power on/off with the engine. I have seen some cables advertised that plug into the OBD port and have an ACC switch and a micro USB outlet for the dash cam. This would allow the dash cam to power on/off with the engine. Some of the comments associated with those mention possible errors to the engine. I just want the camera to cycle otherwise it is always on and I have to remember to plug it in and out.