I intend to install a rear facing Dash Cam, as half the collisions are into the rear of the car.
I have a suitable camera for it if I can get the power from wires in the hatch. I have a camera with front and rear facing lenses but running the wire from front to back is a pain in the ***.
The only constant power in the hatch is the license plate lights. they are supplied the 12 volt via an 18 g wire. I have replaced the lamps with LED lamps.
The question is can the 18 g wire supply enough power for the camera as well as the light, the ground wire to the lamps is 20 g wire.

I guess I could figure it out but it would take days and I would not be sure of the answer.

The camera specs are 12V at 3 to 3.8 W.
The transformer for the camera is 5 volt 2 amp.

Thanks in advance for any help.