[jsb5717]

In theory it should be powered by the running lights, which should only be on when connected to the truck with the trucks running lights turned on. If your camera is always on, and if it is connected to the running lights, then your running lights would also be on all the time.

I would be tempted to pull the camera and trace the wires to see if it's wired to the running lights or another source. It shouldn't be too difficult to reconnect the wiring directly to the running lights if they aren't already.

Are you the original owner? Is it possible that someone else connected the camera to a different source and there is a switch somewhere?