When it comes to wiring a trailer, the 4 pin round trailer connector is one of the most popular options. This connector type is used for trailers that have minimal lighting requirements, such as small utility trailers, boat trailers, or ATV trailers.
What is a 4 Pin Round Trailer Connector?
A 4 pin round trailer connector is a circular connector with four pins, used to connect a trailer to a towing vehicle. This type of connector is also known as a J1587 connector, and it is commonly used for trailers with minimal lighting requirements. The four pins provide power to the trailer’s taillights, brake lights, and left and right turn signals.
Pin Configuration
The pins on a 4 pin round trailer connector are numbered 1 to 4, starting from the 12 o’clock position and moving clockwise. Here is the pin configuration:
| Pin | Function |
|---|---|
| 1 | Ground |
| 2 | Left Turn Signal and Brake |
| 3 | Right Turn Signal and Brake |
| 4 | Taillight Circuit |
How to Wire a 4 Pin Round Trailer Connector
Wiring a 4 pin round trailer connector is a straightforward process that can be completed with a few basic tools. Here are the steps to follow:
Step 1: Gather the Tools and Materials
You will need the following tools and materials:
- 4 pin round trailer connector
- Wire cutters
- Wire strippers
- Butt connectors or crimp connectors
- Electrical tape
- Test light or multimeter
Step 2: Prepare the Wires
Cut the wires to the appropriate length, leaving enough slack for the trailer to move without pulling out the wires. Strip the insulation from the ends of the wires.
Step 3: Connect the Wires
Connect the wires to the appropriate pins on the trailer connector, using butt connectors or crimp connectors. Make sure the connections are tight and secure. Wrap the connectors with electrical tape to prevent moisture from entering.
Step 4: Test the Wiring
Use a test light or multimeter to test the wiring. Turn on the towing vehicle’s lights and check that all of the trailer’s lights are functioning properly.
FAQ
Q. What is the maximum weight that can be towed with a 4 pin round trailer connector?
A. A 4 pin round trailer connector is suitable for towing trailers with a gross vehicle weight rating (GVWR) of up to 3,500 pounds. If you need to tow a heavier trailer, you will need to use a different type of connector.
Q. Can I use a 4 pin round trailer connector for a trailer with brakes?
A. No, a 4 pin round trailer connector does not provide enough circuits to operate trailer brakes. If your trailer has brakes, you will need to use a connector with more pins, such as a 6 or 7 pin round connector or a 4 or 7 pin flat connector.
Q. What do I do if my trailer lights don’t work?
A. If your trailer lights don’t work, check the wiring connections first. Make sure they are secure and not corroded. If the connections are good, test the wiring with a test light or multimeter to see if there is power reaching the lights. If there is power, the problem may be with the lights themselves.
Q. What is the difference between a 4 pin round trailer connector and a 4 pin flat trailer connector?
A. A 4 pin round trailer connector and a 4 pin flat trailer connector are similar, but they have a different shape. A 4 pin round connector is circular, while a 4 pin flat connector is rectangular. Both types of connectors provide the same functions.
Q. Can I convert a 4 pin round trailer connector to a different type of connector?
A. Yes, you can use an adapter to convert a 4 pin round trailer connector to a different type of connector, such as a 4 pin flat connector or a 7 pin round connector. However, make sure the adapter is rated for the weight of the trailer you are towing.
