Wiring the 7 Pole RV Tow Vehicle/Travel Trailer & Fifth Wheel Umbilical Connector Wiring Color Code
Pictured below is the RV 7-way flat-pin umbilical connector, also called the 7 pole plug, which is the connector style most commonly used on RV travel trailers and 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.
When wiring the tow vehicle connector... with the exception of 96-98 Ford and Dodge 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 most commonly used for backup lights not as a ground terminal as many try to use it.
7-way RV Tow Vehicle Connector Wiring Color Code |
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| # | 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 |
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| # | 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