Only way to turn them on when not plugged into the truck is to buy a female plug, and run a jumper from the 12v constant (lead that charges your battery when plugged into the tv) to the parking/clearance lights. Or, you could tweak a blade fuse to turn the lights on, to power the camera.
If I recall correctly, it is the top two on the plug, but verify before you do so.... The fuse trick is how people turn the running lights on when camping instead of using the awning light.
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