I need help figuring out how these 4 wires connect . 3 yellow 1 white. 2 go to outlets, the one with a black rubber insulation and yellow connector I'm not sure what it is. and the black rubber with white connector is live with 120V
No. RV manufacturers usually have wiring harnesses made up that will handle most of the models they produce. Snap connectors, if any, are used to make it easier (quicker) for the assembly workers to route wiring or expand the harness for extra features, longer trailers, etc. Wire nuts aren't much used because they don't stay together well with the vibration common to road travel, so they use a variety of other types of connectors to mate things up as needed. Even screw-type connections can get problematic after a few years of travel.Are those style connectors standard in trailers?