If you own a 2013 GMC Sierra and plan to tow a trailer, it’s important to have the right wiring setup to ensure proper function of all lights and electric components. The 2013 GMC Sierra is equipped with a factory-installed 7-pin trailer wiring harness, which makes the installation process easier than ever. In this article, we will discuss the wiring diagram for the 2013 GMC Sierra, including important tips and FAQs.
What You Need to Know Before Starting
Before you start the installation process, make sure you have the necessary tools and materials. Here are the things you need to get started:
| Tools | Materials |
|---|---|
| Screwdriver | Wire strippers |
| Wire cutters | Electrical tape |
| Pliers | 7-pin trailer wiring harness |
| Drill | Zip ties |
Once you have the tools and materials, you can begin the installation process.
Installation Process
The installation process for the 2013 GMC Sierra trailer wiring harness is relatively simple. Follow these steps:
- Open the hood of your GMC Sierra and disconnect the negative battery cable to avoid any electrical accidents.
- Locate the electrical connector under the rear bumper of your truck. This is where you will connect the trailer wiring harness.
- Remove the electrical connector’s cover and insert the trailer wiring harness connector into it. Make sure it clicks into place.
- Locate the truck’s fuse box and open the cover. Find the 10A fuse labeled “TRLR STOP/TURN” and remove it. Replace it with the 20A fuse provided in the wiring harness kit.
- Secure the trailer wiring harness to your truck’s frame using zip ties. Make sure it’s not hanging too low or too close to the ground.
- Test the wiring harness by connecting your trailer and checking all lights and electric components, including brake lights, turn signals, and reverse lights.
Tips and FAQs
How do I troubleshoot my trailer wiring harness?
If you have trouble with your trailer wiring harness, check the following:
- Make sure all connections are secure and free of corrosion.
- Check the fuses and replace any that are blown.
- Test the trailer wiring harness using a multimeter to ensure proper function.
- Inspect the wiring harness for any damages or exposed wires.
What should I do if my trailer lights don’t work?
If your trailer lights don’t work, check the following:
- Make sure your trailer is properly grounded.
- Check the trailer wiring harness for any damages or exposed wires.
- Check the bulbs in your trailer lights and replace any that are burnt out.
- Test the trailer wiring harness using a multimeter to ensure proper function.
What is the maximum towing capacity for the 2013 GMC Sierra?
The 2013 GMC Sierra has a maximum towing capacity of up to 10,700 pounds when equipped with the available 6.2L V8 engine and the Max Trailering Package.
Can I install a trailer brake controller in my 2013 GMC Sierra?
Yes, you can install a trailer brake controller in your 2013 GMC Sierra. The factory-installed trailer wiring harness includes a trailer brake controller connector, making the installation process easier than ever.
What is a trailer wiring harness?
A trailer wiring harness is a set of wires and connectors that allow you to connect your trailer’s lights and electric components to your vehicle’s power source. A trailer wiring harness ensures proper function of all lights and electric components while towing a trailer.
By following this guide, you can install your 2013 GMC Sierra’s trailer wiring harness with ease and ensure proper function of all lights and electric components while towing. If you have any further questions or concerns, consult your GMC dealer or an experienced mechanic.
