7 Way RV Connector
Pictured below is the Pollak 7 way connector, which is the connector style in most common use on RV trailers and is becoming increasingly popular on horse and utility trailers. This connector is also manufactured by the Theodore Bargman Company and there are also some generics around. They are supposed to be interchangeable and the wiring color code is maintained among the various brands.
As you can see in the illustration 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.
On the tow vehicle side 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.
On the trailer side RV’s for the most part are wired to match the connector colors. Any plug that has been changed or extended, along with horse and utility trailers should be tested when replacing for any reason to be sure the function matches the terminal.
It should be noted below that the center terminal is labeled as an auxiliary circuit, most commonly used for backup lights not a ground terminal as many try to make it.
Also after the connector diagrams find more information on wire colors used by GM, Ford, and Dodge.
Wiring Code 7 way Car End
| # | 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 |
Wiring Code 7 way Trailer End
| # | Color | Gage | Circuit Function | Connector interior |
| 1 | white | 10 | 10 |  |
| 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 |
This chart should be used as a general guide only, you should always test before connecting your wiring.
This chart also may not be accurate for vehicles with factory installed trailer harnesses. In past number of years manufacturers have begun to match the wire colors to the code for the common 7 way RV connector.