16 Ft Trailer Wiring Diagram: Everything You Need to Know

If you’re planning on towing a trailer behind your vehicle, it’s important to have a properly functioning wiring system. This will ensure that your trailer’s lights and brakes work properly, which is not only legal, but it also keeps you and other drivers safe on the road. In this article, we’ll discuss everything you need to know about 16 ft trailer wiring diagrams, including how to read them and how to wire your trailer.

What is a 16 Ft Trailer Wiring Diagram?

A 16 ft trailer wiring diagram is a visual representation of the electrical connections required to power the various components of a trailer. This includes the lights, brakes, and any other electrical systems that may be present on the trailer.

The wiring diagram will typically show the path that the electrical current takes as it travels from the vehicle to the trailer. It will also show the various electrical components on the trailer and how they are connected to one another.

Reading a 16 Ft Trailer Wiring Diagram

When reading a 16 ft trailer wiring diagram, it’s important to first understand what each symbol and color represents. The most common symbols and colors you’ll see on a wiring diagram include:

Symbol/Color Representation
Black Power supply
White Ground connection
Yellow Left turn and brake lights
Green Right turn and brake lights
Brown Taillights and clearance lights
Red Electric brakes

Once you understand what each symbol and color represents, you can start to follow the path of the electrical current and see how the various components are connected.

The 16 Ft Trailer Wiring Diagram: Step-by-Step Instructions

Step 1: Gather Materials

The first step in wiring your 16 ft trailer is to gather all the necessary materials. You’ll need a wiring harness, which can be purchased at most auto parts stores or online. You’ll also need some basic tools, including wire cutters, wire strippers, pliers, and a soldering iron.

Step 2: Strip and Connect Wires

The next step is to strip the wires on both the vehicle and the trailer. This involves using wire strippers to remove the insulation from the wires, exposing the bare metal underneath. You’ll then need to connect the wires on the vehicle to the corresponding wires on the trailer using butt connectors or soldered connections.

Step 3: Install the Wiring Harness

The wiring harness should be installed in a way that is both secure and protected. This means running the harness through areas that are protected from wear and tear, as well as using zip-ties or other fasteners to keep the wiring in place. You should also use electrical tape or heat shrink tubing to protect the connections from moisture and other environmental factors.

Step 4: Test the System

Before hitting the road, it’s important to test the wiring system to ensure that everything is functioning properly. This can be done by connecting the trailer to the vehicle and turning on the lights and brakes. If everything is working as it should, you’re good to go!

FAQs About 16 Ft Trailer Wiring Diagrams

What if My Trailer Has Additional Electrical Components?

If your trailer has additional electrical components, such as a refrigerator or air conditioning unit, you may need to install a secondary wiring system. This will typically involve installing a separate power source, such as a deep cycle battery, to power these additional components.

What if I Have a 5-Wire System Instead of a 4-Wire System?

If your trailer has a 5-wire system instead of a 4-wire system, the fifth wire is typically used to power the reverse lights. This wire can be connected to the reverse light circuit on the vehicle to power the reverse lights on the trailer.

Do I Need Any Special Tools to Install a Wiring Harness?

While some specialized tools may be helpful, such as a crimping tool or a heat gun, most of the tools required to install a wiring harness are standard tools that you likely already have in your toolbox. If you’re not comfortable with soldering, you may want to consider using butt connectors or other types of wire connectors instead.

What if I’m Not Comfortable Installing a Wiring Harness Myself?

If you’re not comfortable installing a wiring harness yourself, it’s always best to seek the help of a professional. This will ensure that the wiring is installed correctly and that your trailer is safe and legal to tow on the road.

Is It Legal to Tow a Trailer Without Proper Wiring?

No, it is not legal to tow a trailer without proper wiring. In addition to being a safety hazard, it is also against the law. If you’re caught towing a trailer without proper wiring, you could face fines or even have your vehicle impounded.


Installing a wiring harness on your 16 ft trailer is essential for both safety and legal reasons. By following the step-by-step instructions outlined in this article and understanding how to read a wiring diagram, you can ensure that your trailer’s electrical systems are functioning properly and keeping you and other drivers safe on the road.