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Wiring Code 7 Way Car End GM Trailer Wiring Code
Wiring Code 7 Way Trailer End 6 Way Connector Wiring
Dodge Tow Vehicles with the Factory Tow Package Brake Connector

RV Manual
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We are developing an online Manual so that you may enjoy your RV to it's fullest. This is a work in progress and is subject to change at any given time.  It is also a generic peace of work and is meant only as a general guide, it should not be taken as absolute fact.  Each RV is distinct and individual in it's own right, do not take anything written here literally as it may or may not apply to the exact RV you will be using.  Some information provided in these pages are only suggestions.  Please read Your RV page as we have more helpful information.

 

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 [7 way connector]
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.



Wiring Code 7 way Trailer End
# Color Gage Circuit Function connector interior
1 white 10 common ground [7 way connector]
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.
 

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 2-3 years manufacturers have begun to match the wire colors to the code for the common 7 way RV connector. More on that after the chart.

 
Caution if your vehicle has a diagnostic indicator that tells you when a lamp is burned out or not functioning, you may need special wiring adapters and testers. Not using these adapters may cause damage to the vehicle wiring or computer.
function GM Ford Chrysler
left turn & brake lights yellow lt green w/orange stripe dk green
right turn & brake lights dk green orange w/blue stripe brown
tail lights brown brown black or black w/yellow stripe
back up lights lt green black w/pink stripe violet
ground - see note 1 black black or grey black
In addition to the above some cars and trucks have a separate light for the brake light, most commonly identified by amber turn lenses in the rear. Chrysler and Jeep may have the separate light and use red lenses. If you have this type of wiring a converter is required.
brake light lt blue or pink red w/green stripe white
Note 1: We recommend attaching the trailer harness ground directly to the frame or a solidly attached sheet metal part, using a screw or bolt. The single most common cause of trailer lighting problems is a poor ground on the tow vehicle or trailer.

Notes about GM OEM wiring harness. Most GM vehicles except '99 & 2000 Silverados match the following.

 

GM trailer wiring code
white ground
yellow left/brake
green right/brake
brown tail
light green backup
blue trailer brakes
red * 12 volt +
* Pickups only: since approximately 1996 the 12 volt + wire is orange. The orange and blue wires are in a separate bundle taped to the wire harness that runs down the frame on the drivers side. A white wire may also be found in that bundle, it is a brake light wire which is not normally used for trailer wiring.

 

Dodge tow vehicles with the Factory Tow Package Brake Connector

Dodge vehicles with this package are equipped with a 15 amp fused power line which is insufficient for 3 & 4 axle (6 or 8 brake) applications. For 3 & 4 axle (6 or 8 brake) applications a separate power wire should be installed directly from the battery positive to the brake control and should include an inline 30 amp auto reset circuit breaker.

 

Ford tow vehicles with the Factory Tow Package Brake Connector

Ford vehicles with this package are equipped with a 20 amp fused power line which is insufficient for 3 & 4 axle (6 or 8 brake) applications. For 3 & 4 axle (6 or 8 brake) applications a separate power wire should be installed directly from the battery positive to the brake control and should include an inline 30 amp auto reset circuit breaker.