Need to wire a 50A RV circuit.

I found the info needed.
I need to know where the wires connect on the receptacle.
 
Standard practice is ground to green or the big round pin, neutral to the bright screw and hots to the brass colored screws. Wire colors will be Green (green and yellow stripe in Europe) as ground, white as neutral, and any other color as hots. Watch out if the system has been tinkered with by someone that didn't know what they were doing! Use your multimeter the check.
 
But since it is a three wire setup, chance are that it is just a black/white/green or bare wire. in which case it is a good chance that black & white are hots, and the other wire is ground or neutral. Whatever it is, the two wide pins are hot, and the small round is the ground or neutral.
 
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