ItsyRV wrote:
It seems to be a common mistake especially when a person or electrician isn't familiar with the 30 amp RV plug. They see the schematic and know which side each wire goes until they turn it around to connect the wires and forget that left is now right and right is now left. At least you weren't the first user who discovered the dreaded 30 amp 220 volt mistake.
Black always goes to the brass screw, white always goes to the silver screw, green to the green screw. That way you don't have to worry about sides, and position, left, right, front, back, etc.