If you own a trailer, it’s important to know how to properly wire it to your vehicle. Wiring your trailer correctly can ensure that all of your lights and signals work properly, making towing safer for both you and other drivers on the road. In this article, we’ll take a look at four-prong trailer wiring diagrams and walk you through the process of wiring your trailer.
What Is Four-Prong Trailer Wiring?
Four-prong trailer wiring is the most common type of wiring used for small trailers. It consists of four wires that connect your trailer’s lights and signals to your vehicle’s electrical system. The four wires are typically color-coded, making installation and troubleshooting easier.
What Are the Four Wires Used for in Four-Prong Trailer Wiring?
The four wires used in four-prong trailer wiring are:
| Wire Color | Function |
|---|---|
| Brown | Tail Lights |
| Green | Right Turn Signal |
| Yellow | Left Turn Signal |
| White | Ground |
The brown wire powers your trailer’s tail lights, while the green and yellow wires power the right and left turn signals, respectively. The white wire is used for grounding.
Why Is Four-Prong Trailer Wiring the Most Common Type of Wiring for Small Trailers?
Four-prong trailer wiring is the most common type of wiring used for small trailers because it is simple and effective. It provides all the necessary connections for your trailer’s lights and signals, without the need for additional wiring or complicated installation procedures. Additionally, four-prong trailer wiring is affordable and readily available at most auto parts stores.
How to Wire Your Trailer with Four-Prong Trailer Wiring
Materials You Will Need
To wire your trailer with four-prong trailer wiring, you will need:
- Four-prong trailer wiring harness
- Wire cutters/strippers
- Electrical tape
- Zip ties
Step-by-Step Instructions
Follow these steps to wire your trailer with four-prong trailer wiring:
- Locate your vehicle’s trailer wiring connector. This will be located on the rear bumper or hitch of your vehicle.
- Using wire cutters/strippers, strip 1/2 inch of insulation from the ends of the four wires in your trailer wiring harness.
- Connect the brown wire from your trailer wiring harness to the brown wire in your vehicle’s trailer wiring connector.
- Connect the green wire from your trailer wiring harness to the green wire in your vehicle’s trailer wiring connector.
- Connect the yellow wire from your trailer wiring harness to the yellow wire in your vehicle’s trailer wiring connector.
- Connect the white wire from your trailer wiring harness to a clean, unpainted metal surface on your vehicle. This will provide a grounding connection for your trailer’s lights and signals.
- Use electrical tape to secure the connections and prevent them from coming loose.
- Use zip ties to neatly bundle and secure the wiring to your trailer and vehicle.
- Test your trailer’s lights and signals to ensure they are working properly.
Frequently Asked Questions
How Do I Troubleshoot My Trailer’s Lights and Signals?
If your trailer’s lights and signals are not working, there are a few things you can check:
- Ensure that your trailer is properly grounded to your vehicle.
- Inspect the wiring for any damage, such as frayed or corroded wires.
- Check the fuses in your vehicle’s electrical system to ensure they are not blown.
- Use a multimeter to check for voltage at the wiring connections.
Do I Need to Use a Relay with Four-Prong Trailer Wiring?
If your trailer has a high power draw, such as with electric brakes, you may need to use a relay with your four-prong trailer wiring. A relay will help to ensure that your trailer’s lights and signals receive the necessary power from your vehicle’s electrical system.
Can I Use Four-Prong Trailer Wiring with a Five-Wire Harness?
No, four-prong trailer wiring is not compatible with a five-wire harness. A five-wire harness typically includes an additional wire for electric brakes. If your trailer has electric brakes, you will need to use a five-wire harness.
Can I Install Four-Prong Trailer Wiring Myself?
Yes, you can install four-prong trailer wiring yourself, as long as you have the necessary materials and tools, and follow the proper instructions. However, if you are unsure about your ability to install the wiring correctly, it is recommended that you seek the assistance of a professional mechanic or electrician.
