As a proud owner of a 2020 GMC Sierra, it’s important to know the ins and outs of every component of your vehicle. One such component is the tail light wiring system, which is responsible for ensuring that your tail lights function properly. In this article, we’ll take a deep dive into the 2020 GMC Sierra tail light wiring diagram, discussing its components, how to troubleshoot issues, and more. Let’s get started!
What is the Tail Light Wiring System?
The tail light wiring system is responsible for powering the tail lights on your 2020 GMC Sierra. The system includes various components such as the tail light bulbs, wiring harness, and connectors. The tail light wiring system is essential for your vehicle’s safety, as it ensures that your rear lights are fully functional and visible to other drivers on the road.
Components of the Tail Light Wiring System
The tail light wiring system consists of several essential components, including:
| Component | Description |
|---|---|
| Tail light bulbs | The bulbs that illuminate your tail lights when you brake, turn, or drive at night. |
| Wiring harness | The set of wires that connects your tail light bulbs to your vehicle’s electrical system. |
| Connectors | The plugs that connect the wiring harness to your tail light bulbs. |
| Fuses and relays | The electrical components that protect your tail light wiring system from short circuits and overloads. |
Each of these components plays a crucial role in ensuring that your tail lights function correctly.
How to Troubleshoot Tail Light Wiring Issues
If you’re experiencing issues with your Sierra’s tail lights, it may be due to a problem with the tail light wiring system. Here are some steps you can take to troubleshoot the issue:
Step 1: Check the Bulbs
The first step is to check the tail light bulbs to ensure they are not burnt out. If you notice that one or both of your tail lights aren’t working, it’s likely due to a blown bulb. You can remove the tail light assembly and check the bulb for any signs of damage or burnt-out filaments. If the bulb needs to be replaced, make sure to use the correct type of bulb for your 2020 GMC Sierra.
Step 2: Inspect the Wiring Harness
If the bulbs are not the issue, the next step is to inspect the wiring harness for any damage or corrosion. Over time, the wiring harness can become damaged due to exposure to moisture, debris, or wear and tear. Inspect the wiring harness for any cracks, frayed wires, or loose connections. If there is any damage, you may need to replace the wiring harness.
Step 3: Check the Connectors
The connectors that connect the wiring harness to the tail light bulbs can also become damaged or corroded over time. Inspect the connectors for any signs of damage, such as cracks or corrosion. If there is any damage, you may need to replace the connectors.
Step 4: Check the Fuses and Relays
If none of the above steps resolves the issue, it may be due to a problem with the fuses or relays. Check the fuses and relays that are responsible for the tail light circuit to ensure they are not blown. If a fuse or relay is blown, it will need to be replaced.
Conclusion
Having a deep understanding of your vehicle’s wiring system is essential for proper maintenance and ensuring safety on the road. We hope this article has provided valuable insights into the 2020 GMC Sierra tail light wiring diagram. Remember, if you experience any issues with your tail lights, it’s important to take action right away and troubleshoot the issue to ensure they are functioning correctly.
FAQs
What size tail light bulb does a 2020 GMC Sierra use?
The 2020 GMC Sierra uses a 7443 bulb for its tail lights.
Can I use LED bulbs for my 2020 GMC Sierra tail lights?
Yes, you can use LED bulbs for your 2020 GMC Sierra tail lights. However, it’s important to ensure that the bulbs are compatible with your vehicle’s wiring system and won’t cause any issues with the electrical components.
What should I do if my 2020 GMC Sierra tail lights aren’t working?
If your 2020 GMC Sierra tail lights aren’t working, you can try troubleshooting the issue by checking the bulbs, wiring harness, connectors, fuses, and relays. If you are not comfortable performing these steps on your own, it’s important to take your vehicle to a qualified mechanic for further inspection.
How much does it cost to replace the tail light wiring harness on a 2020 GMC Sierra?
The cost to replace the tail light wiring harness on a 2020 GMC Sierra can vary depending on the extent of the damage and the cost of the replacement parts. On average, it can cost anywhere from $50 to $200 for a new wiring harness, plus labor fees if you take it to a mechanic.
