2001 23ft. Prowler camper, the main power cord has three wires. Black, green and white. I need a new male plug on end, want to be positive black is hot, thanks much for the help, johnny.

The grounded conductor, Neutral, must be only white or gray. It can also be white with 3 black stripes on it.

All the other colors of the spectrum, including black can be used for the ungrounded, hot, conductor except green or green with a yellow stripe. These are reserved for ground.

So yes, Black is the Hot conductor.