How to Wire 50 Amp Service for an RV | It Still Runs Locate an unused double-pole 50 amp breaker, or install a double-pole 50 amp breaker in a vacant location. Connect the red wire to one terminal on the outlet side of the breaker, and connect the black wire to the other terminal on the outlet side of the breaker. Connect the white wire to neutral bus-bar. How To Wire A 50 Amp RV Plug: Here Are 5 Quick And Easy Steps Sep 29, 2017How To Wire A 50 Amp RV Plug: Here Are 5 Quick And Easy Steps. In this article, we will be guiding you on how you can wire your 50 Amp RV plug in just a few simple steps.