How to find the hot wire? I bought a camera on e-Bay and got it with a connector with two wires: one red and the other red-with-black-stripto hook the camera up to the battery. The connecter shows the hot wire must be in the center. I switch on my meter foe DC voltage measuring and touch with one pin the external part of the connector and with the other pin - a wire, one by one. One measurement gives me a value the other - not. What wire leads to the external part of the connector? Is there usual scheme in US - like the red is always hot?