RV Plug Wiring: A Comprehensive Diagram

Connecting an RV to a tow vehicle is easy when you have the correct combination of a 7-way RV plug and a 7-way trailer plug. When wiring these two components together, it is important to understand the color codes and the purpose of each pin. This article will discuss the steps necessary to wire a 7-way RV plug, the color codes for each pin, the differences between the RV and trailer plugs, how to test your wiring, the recommended gauge of wire to use, if a 4-way plug adapter can be used, and how to troubleshoot and replace a damaged RV plug.

How to Wire a 7-Way RV Plug

Wiring a 7-way RV plug is a simple process that requires only a few tools and some electrical tape. First, gather all the necessary tools, including wire cutters, wire strippers, electrical tape, and a voltmeter. Next, identify the corresponding pin of the 7-way RV plug with the color code. You will then cut the appropriate length of wire for the connection you are making, and strip 3/4 inch of insulation from each end of the wire. Connect one end of the wire to the corresponding pin on the 7-way RV plug and the other end to the corresponding pin on the 7-way trailer plug. Secure the connection with electrical tape. Finally, use a voltmeter to test for continuity before reconnecting the two plugs.

Color Codes for a 7-Way RV Plug

The seven pins on the 7-way RV plug have a specific color code associated with them. The color code is used to indicate the purpose of each pin. The colors are as follows:

White – Auxiliary Power
Brown – Tail Lights
Green – Right Turn/Stop
Yellow – Right Brake
Red – Left Stop/Turn
Blue – Electric Brakes
Black – 12 Volt Power

Difference Between a 7-Way RV Plug and a 7-Way Trailer Plug

The 7-way RV plug is designed to connect the tow vehicle's electrical system to the RV. The 7-way trailer plug is designed to provide power to the trailer brakes, running lights, and turn signals. The RV plug also has an auxiliary power terminal that is used to provide power to devices like electric winches or battery chargers. The trailer plug does not have this terminal.

Testing Your Wiring

Once you have wired the two plugs together, it is important to test for continuity before reconnecting the plugs. To do this, use a voltmeter to test for current flow between the two pins. If the voltage between the pins is greater than 12 volts or less than 0 volts, there is a problem with the wiring and you must determine the source of the problem.

What Gauge Wire Should I Use for RV Plug?

The recommended gauge of wire for a 7-way RV plug is 12 AWG or 14 AWG. This type of wire is durable enough to withstand the temperature changes and vibrations experienced on the road. Additionally, 12 AWG or 14 AWG wire allows for additional voltage protection, which is important for the many electrical components connected to the RV.

Can I Use a 4-Way Plug Adapter on a 7-Way RV Plug?

A 4-way plug adapter cannot be used on a 7-way RV plug. This is because the 4-way adapter only contains four pins while the 7-way RV plug has seven pins with different functions. Using a 4-way plug adapter will cause the RV electrical system to be incomplete and may lead to problems with the electrical components.

How to Troubleshoot a Faulty RV Plug

If your RV plug is not functioning properly, there are several steps you can take to troubleshoot the issue. First, inspect the plug for any damage or corrosion. Next, check the plug for any loose connections. If the plug appears to be in good condition, you will need to check the wiring. Make sure that each wire is connected securely to its respective pin. Finally, use a voltmeter to test for continuity between the two plugs. If there is no current, there may be a problem with the wiring and you should have it inspected by a professional.

What is the Purpose of the Auxiliary Power Terminal on an RV Plug?

The auxiliary power terminal on an RV plug is used to provide power to devices such as electric winches or battery chargers. This terminal is not present on a standard 7-way trailer plug. The auxiliary power terminal allows the user to connect these devices directly to the RV plug without having to run additional wiring.

Can I Replace a Damaged RV Plug Myself?

Yes, it is possible to replace a damaged RV plug yourself. However, it is recommended that you obtain a replacement plug from a reputable supplier and have it installed by a qualified electrician. This will ensure that the new plug is installed correctly and safely.

Wiring a 7-way RV plug is a relatively straightforward task but it’s important to understand the color codes and the proper connections for each pin. By following the steps outlined in this article, you will be able to make sure that your RV is connected correctly and safely. Additionally, understanding the differences between the RV and trailer plugs, the recommended gauge of wire to use, and how to troubleshoot and replace a damaged RV plug will help to ensure that your RV is always ready for the road.