If you’re looking for a comprehensive guide to the 2018 Ram trailer wiring diagram, you’ve come to the right place. This article will cover everything you need to know about wiring your trailer to your truck, including the various types of connections, wiring diagrams, and frequently asked questions.
Types of Trailer Connections
Before we dive into the wiring diagram, let’s briefly cover the different types of connections you may encounter. The most common types are 4-way and 7-way connections. The 4-way connection is the simplest and is typically used for small trailers with basic lighting functions. The 7-way connection provides more functionality and is used for larger trailers that require more power.
In addition to these two types of connections, you may also encounter a 6-way or 5-way connection. The 6-way connection is similar to the 7-way, but with one fewer pin. The 5-way connection is similar to the 4-way, but with an additional pin for a ground connection.
Wiring Diagrams
Now, let’s take a closer look at the wiring diagram for the 2018 Ram trailer connection. This diagram will show you the various components of the wiring system and how they are connected.
| Pin | Wire Color | Function |
|---|---|---|
| 1 | Green | Right Turn/Brake |
| 2 | Yellow | Left Turn/Brake |
| 3 | Brown | Running Lights |
| 4 | White | Ground |
| 5 | Blue | Brake Controller Output |
| 6 | Red/Black | Auxiliary Power/Lighting |
| 7 | Red | Reverse Lights |
It’s important to note that this diagram is specific to the 2018 Ram and may differ for other makes and models. Always refer to your vehicle’s owner’s manual for the correct wiring diagram.
Pin 1 – Green Wire
The green wire is responsible for the right turn and brake lights on your trailer. This wire should be connected to the corresponding wire on your trailer’s harness.
It’s important to ensure that the connections are secure and that there are no loose wires or connections. A loose connection can cause issues with your trailer’s lighting system and potentially cause a safety hazard while driving.
Pin 2 – Yellow Wire
The yellow wire is responsible for the left turn and brake lights on your trailer. Like the green wire, this wire should be connected to the corresponding wire on your trailer’s harness.
Again, it’s important to ensure that the connections are secure and that there are no loose wires or connections.
Pin 3 – Brown Wire
The brown wire is responsible for the running lights on your trailer. This wire should be connected to the corresponding wire on your trailer’s harness.
It’s important to note that some trailers may not have running lights. If your trailer does not have running lights, the brown wire may not be required.
Pin 4 – White Wire
The white wire is the ground wire and should be connected to a suitable ground point on your trailer.
It’s important to ensure that the ground connection is secure and that there are no loose connections. A loose ground connection can cause issues with your trailer’s lighting system and potentially cause a safety hazard while driving.
Pin 5 – Blue Wire
The blue wire is for the brake controller output and should only be used if your trailer has electric brakes. If your trailer does not have electric brakes, the blue wire may not be required.
If your trailer does have electric brakes, it’s important to ensure that the brake controller is properly installed and calibrated. A poorly installed or calibrated brake controller can cause issues with your trailer’s braking system and potentially cause a safety hazard while driving.
Pin 6 – Red/Black Wire
The red/black wire is for auxiliary power and lighting on your trailer. This wire should be connected to the corresponding wire on your trailer’s harness.
If your trailer does not have any auxiliary power or lighting, the red/black wire may not be required.
Pin 7 – Red Wire
The red wire is for the reverse lights on your trailer. This wire should be connected to the corresponding wire on your trailer’s harness.
If your trailer does not have reverse lights, the red wire may not be required.
Frequently Asked Questions
What do I do if my trailer’s lights aren’t working?
If your trailer’s lights aren’t working, the first thing to check is the connections. Ensure that all of the connections are secure and that there are no loose wires or connections. If the connections are all secure, check the fuses for the trailer and truck to see if any have blown.
If none of these solutions work, it’s recommended to take your trailer to a professional trailer mechanic for further diagnosis and repair.
Can I tow a trailer without trailer brakes?
It depends on the weight of the trailer and the state you reside in. Some states require trailer brakes for trailers over a certain weight, while others do not. Check your state’s trailer towing laws to ensure that you’re in compliance.
What is a brake controller?
A brake controller is a device that controls the electric brakes on your trailer. The brake controller sends a signal to the trailer’s brakes when you apply the brakes on your vehicle, helping to slow down the trailer and bringing it to a stop more effectively.
How do I install a brake controller?
It’s recommended to have a professional installer install your brake controller. They will ensure that the brake controller is properly calibrated and installed for the specific make and model of your vehicle.
If you’re comfortable with basic wiring and have experience with installing automotive electronics, you may be able to install the brake controller yourself. Always refer to the manufacturer’s installation instructions and your vehicle’s owner’s manual for the correct wiring diagram and installation procedure.
How do I maintain my trailer’s wiring system?
Regular maintenance is key to ensuring that your trailer’s wiring system is working properly. Inspect the wiring and connections before each use and replace any worn or damaged components. Keep the wiring clean and free of corrosion, and use dielectric grease to prevent corrosion from forming.
Additionally, it’s a good idea to have your trailer’s wiring system inspected by a professional trailer mechanic at least once a year.
What if I need to tow a trailer with a different connection?
If you need to tow a trailer with a different connection than your truck has, you may need to use an adapter. Adapters are available for most types of connections and are typically easy to use. However, it’s important to ensure that the adapter is properly rated for the weight of the trailer you’re towing and that all of the connections are secure.
Always refer to the manufacturer’s instructions for the adapter and consult a professional if you have any concerns or questions.
Conclusion
Wiring your trailer to your truck may seem daunting, but with the right knowledge and tools, it can be a straightforward process. Always refer to your vehicle’s owner’s manual and the correct wiring diagram for your specific make and model, and don’t hesitate to seek professional help if you’re unsure.
Regular maintenance and inspections are key to ensuring that your trailer’s wiring system is working properly and safely. By following these guidelines, you can enjoy safe and reliable trailer towing for years to come.
