Below is the RV Umbilical Cord Wiring Color Code for the 7-way flat-pin umbilical connector, also called the 7 pole plug. This is the connector style most commonly used on North American travel trailers and RV fifth wheels This connector is made by many companies but they are supposed to be interchangeable and the wiring color code is observed among the various brands.

As you can see in the illustrations below the back side of the connector body is labeled at each terminal. The labels are listed below with the function assigned to that pin.

RV Umbilical Cord Wiring Color Code

When wiring the tow vehicle connector, with the possible exception of pickups and SUV’s with factory installed trailer wiring, wire color alone should not be relied on, always test and match the function to the appropriate terminal.

Most RV travel trailers are wired to match the 7-pole plug connector colors but they should be tested when replacing a connector to be sure the function matches the terminal.

It should be noted below that the center terminal is labeled as an auxiliary circuit but is commonly used for backup lights, not as a ground terminal as many try to use it.

Wiring Color Code Tow Vehicle Connector
#	Color	Gage	Circuit Function	connector interior
1	white	10	common ground
2	blue	12	electric brake
3	green	14	tail/running lights
4	black	10	battery charge (+)
5	red	14	left turn/stop
6	brown	14	right turn/stop
7	yellow	14	auxiliary/back up
NOTE: #7 is the center terminal and currently is most commonly used for backup lights.

7-way RV Travel Trailer Connector Wiring Color Code
#	Color	Gage	Circuit Function	connector interior
1	white	10	common ground
2	blue	12	electric brake
3	green	14	tail/running lights
4	black	10	battery charge (+)
5	red	14	left turn/stop
6	brown	14	right turn/stop
7	yellow	14	auxiliary/back up
NOTE: #7 is the center terminal and currently is most commonly used for backup lights.

You may also want to read: Emergency Flasher for RV Travel Trailer Marker Lights