If you own a Chevy truck or van, you may want to install a trailer hitch to tow a trailer. The first step in doing so is to wire it up so that the trailer’s lights and brakes work. This requires a 7 pin wiring diagram which we will discuss in this article. We’ll cover everything from the basics of wiring to frequently asked questions about trailer hitch wiring.
Basic Wiring Principles
Before we jump into the specifics of a 7 pin wiring diagram, let’s review some basic principles of wiring.
First, you’ll want to start with a clean, dry work area. This is important for safety and to prevent any electrical shorts or other problems.
Second, you’ll need the proper tools. This includes a wiring diagram, wire strippers, crimpers, electrical tape, and a voltage tester.
Third, you’ll need to determine the correct wire gauge for your application. This will depend on the size of your trailer and the distance between the trailer and the tow vehicle.
Fourth, you’ll want to make sure to follow the wiring diagram precisely. Deviating from it can cause problems and may even be dangerous.
How to Read a Wiring Diagram
A wiring diagram is a visual representation of the electrical connections between components. It includes symbols that represent the various wires, connectors, and other parts.
The first step in reading a wiring diagram is to understand the symbols. A key or legend is typically included that explains what each symbol represents.
Once you understand the symbols, you can then follow the lines and see how the components are connected.
For example, a line connecting two symbols indicates that those two components are connected. A dashed line indicates that the connection is not continuous.
The 7 Pin Wiring Diagram
The 7 pin wiring diagram is the standard wiring diagram for trailer hitches. It includes seven pins that connect the tow vehicle to the trailer.
The pins are labeled as follows:
| Pin 1 | Ground |
| Pin 2 | Tail lights |
| Pin 3 | Left turn signal/brake |
| Pin 4 | Right turn signal/brake |
| Pin 5 | Electric brakes |
| Pin 6 | Back-up lights |
| Pin 7 | 12V+ auxiliary power |
Now that we know what each pin is for, let’s look at how to wire them up.
Wiring the 7 Pin Connector
The first step in wiring the 7 pin connector is to connect the ground wire. This is typically a white wire that needs to be connected to a metal surface on the tow vehicle.
Next, connect the tail lights wire to the brown wire on the connector. This wire controls the trailer’s taillights.
The left turn signal/brake wire is connected to the yellow wire on the connector. The right turn signal/brake wire is connected to the green wire.
The electric brakes wire is connected to the blue wire on the connector. This wire controls the trailer’s electric brakes.
The back-up lights wire is connected to the center pin, which is the white wire.
Finally, the 12V+ auxiliary power wire is connected to the black wire on the connector. This wire provides power to accessories on the trailer, such as interior lights or a winch.
Frequently Asked Questions
What if I have a four wire trailer?
If you have a four wire trailer, you can still use the 7 pin wiring diagram. Simply leave out the electric brakes wire and the 12V+ auxiliary power wire.
What if my trailer has a different wiring setup?
If your trailer has a different wiring setup, you’ll need to consult a wiring diagram specific to your trailer.
What is the best way to test my wiring?
The best way to test your wiring is to use a voltage tester. This will tell you if you have power to each wire and if it’s the correct voltage.
What do I do if one of my trailer lights isn’t working?
If one of your trailer lights isn’t working, start by checking the bulb. If it’s not the bulb, check the wiring connections to make sure they’re secure. Finally, check the wiring with a voltage tester to make sure there’s power.
How can I prevent my wiring from becoming corroded?
One way to prevent your wiring from becoming corroded is to use dielectric grease on the connectors. This will protect them from moisture and other contaminants.
Conclusion
Wiring a trailer hitch may seem daunting, but with the right tools and knowledge, it can be a breeze. This article covered the basics of wiring and the 7 pin wiring diagram specifically. We also provided some frequently asked questions to help troubleshoot any issues you may encounter.
