Hospital Grade SA200 three prong receptacle
this tutorial will explain the proper pinout of a three prong remote receptacle often found on a dc generator
Circled in yellow is (main shunt coil wire blue in color)
Circled in blue is (DC negative Red Wire from Exciter)
Circled in black is (DC positive Black Wire from Excited)
This is what I consider Orientation Style "A". It is very important that your remote receptacle is wired in the following manner or receiver damage will occur.