This guide is not meant to be a full training manual on all aspects of RV wiring, rather it is designed to help the average do-it-yourselfer find and repair the most common wiring problems. If you are not comfortable using tools or if the problem is found to be in the wiring harness of the tow vehicle, it is recommended that you seek the help of a professional.

Most problems with RV wiring originates in the tow vehicle socket and/or the trailer plug. With all the rain water, road salt, and grime thrown up by the tires, these components are subjected to the worst conditions for an electrical connection.

First, check the inside connections of the tow vehicle socket for corrosion, broken wires or other obvious problems.

Then inspect the trailer plug for the same conditions. Any deterioration of the terminals or the wires themselves should be repaired now. It is often more economical (and less stressful) to replace the entire plug/socket and make any needed repairs to the wires at this point. Often the problem is solved before delving deeper into the wiring maze.

It's not as hard as you think!

Tools you will need ...

• Wire strippers
• Phillips screwdriver
• Flat screwdriver
• In-line fuse holder or circuit breaker.

Wiring the 4 pole utility trailer plug

Wiring the 6 pole horse trailer plug

Wiring the 7 pole RV Tow Vehicle Socket

Toad wiring made easy

Emergency Flasher for your RV

Wiring the 4 pole utility trailer plug

 

 

Wiring the 6 pole horse trailer plug

Pin locations for the 6 pole plug
ASME wiring color code

Terminal Marking	Wire Color	Function
GD	White	Ground
TM	Brown	Running Lights
LT	Yellow	Left turn/brake light
RT	Green	Right turn/brake light
ST	Blue	Brake Control
Aux	Black	Power

Pin locations for the 6 pole plug
RV wiring color code

Terminal Marking	Wire Color	Function
GD	White	Ground
TM	Green	Running Lights
LT	Red	Left turn/brake light
RT	Brown	Right turn/brake light
ST	Blue	Brake Control
Aux	Black	Power

 

 

Wiring the 7 pole RV Vehicle Socket

There are two wiring codes for different 7 pole plug sets.

Most RV's use the RV wiring code for the type of plug/socket
that has 6 flat contacts surrounding the center round pin.

Semi's and other commercial trailers use the ASME
(American Society of Mechanical Engineers) type of 7-pole plug set.
This plug has 6 round contacts surrounding the center pin.
The wiring color code for this plug is not the same as the
RV 7 pole plug described below, and will be included at a future time.

View looking into the front (contact) end of tow vehicle socket.

7 pole RV plug/socket.

Terminal	Wire Color	Function	Location - Truck socket	Location Trailer plug
1	White	Ground	7:00 o'clock	5:00 o'clock
2	Blue	Brakes	5:00 o'clock	7:00 o'clock
3	Green	Running	10:00 o'clock	2:00 o'clock
4	Black	Power	2:00 o'clock	10:00 o'clock
5	Red	LT & Stop	9:00 o'clock	3:00 o'clock
6	Brown	RT & Stop	3:00 o'clock	9:00 o'clock
7	Yellow	Aux or BU	Center	Center

 

 

Toad Wiring Made Easy

Note: a "toad" is a small vehicle towed behind a motorhome.

Instead of hooking in to the cars existing system you can simply mount a very nice set of lights under the rear bumper, below the existing light array, and run separate wires under the toad chassis.

This method would eliminate the neccessity of installing diodes into the toad lighting circuits to prevent feedback problems. A four pole connector at the front of the toad connects the add-on lights to the motor homes circuits.

Information presented on this site is for educational or entertainment purposes only. You are responsible for your own actions should you use any information found on this website.

Disclosure: Advertisements are placed on this website to offset the cost of maintenance and to keep this site free for everyone to use. Owners of this website will receive compensation for products and services purchased through featured advertisements. All claims of actual user results should be considered atypical. "As an Amazon Associate, I earn from qualifying purchases." Read full disclosure here.

Website © Les Doll All rights Reserved

Legal