I had this issue when I installed a cheap Costco dashcam. Power would keep it on until I unplugged it from the port. Annoying. Then with a separate issue with my phone connection, I toggled off Bluetooth in the stereo settings, and power was cutoff from the 12v port as soon as I turned off my Maverick. Thinking it couldn’t be something that simple I turned Bluetooth back on and tested it out. Power stayed on after I shut off the truck. So from that point on I disabled Bluetooth in truck settings.
