1991 Chevy S10 Tail Light Wiring Diagram: A Comprehensive Guide

If you are driving a 1991 Chevrolet S10, you may be facing a common issue of malfunctioning tail lights. One of the probable causes of this problem is a faulty wiring circuit. In this article, we will provide you with a detailed guide on how to troubleshoot and solve the wiring issue in your S10 truck. Read on to learn more!

Understanding the Wiring Diagram

Before we dive into the troubleshooting steps, it is crucial to understand the S10 tail light wiring diagram. This diagram shows how the tail lights of your truck are wired and connected to each other, the car battery, and the switch. Additionally, it shows the colors of the wires that power each component.

You can obtain the wiring diagram for your 1991 Chevy S10 from the manufacturer’s website or auto repair websites. This information will help you pinpoint any problematic areas in the wiring and fix them efficiently.

Table 1: Wire Color Coding

Wire Color Description
White Ground wire
Black Tail light circuit
Yellow Left turn signal circuit
Green Right turn signal circuit
Brown License plate light circuit

Troubleshooting the Wiring Circuit

Step 1: Check the Bulbs and Sockets

The first step in troubleshooting any wiring issue is to check the bulbs and sockets. Start by removing the tail light covers and inspecting the bulbs. If you notice any burnt-out bulbs, replace them with new ones.

Next, examine the sockets for any signs of damage, such as corrosion or broken wires. If you find any faulty sockets, replace them immediately.

Step 2: Inspect the Wiring Harnesses

If the bulbs and sockets are in good condition, the next step is to inspect the wiring harnesses. Start by checking the fuses related to the tail lights, brake lights, and turn signals. If any of these fuses are blown, replace them with new ones and check if the tail lights are working properly.

If the fuses are not the issue, proceed to inspect the wiring harnesses. Look for any cut, frayed, or corroded wires. If you find any damaged wires, replace them with new ones. Additionally, check the wiring connections and ensure that they are tight and secure.

Step 3: Use a Multimeter

If you still cannot pinpoint the issue with the wiring, you can use a multimeter to test the wiring circuit. Set the multimeter to measure resistance and check the wiring for continuity. If the multimeter shows no continuity, there is a break in the circuit that you need to locate and repair.


Q: Why are my tail lights not working?

A: There are several possible reasons why your tail lights may not be working. Some of the most common issues include faulty bulbs, damaged sockets or wiring, blown fuses, and faulty brake light switches.

Q: Can I replace the tail light bulbs myself?

A: Yes, you can easily replace the tail light bulbs yourself. Start by removing the tail light covers and removing the old bulbs. Then, insert the new bulbs and replace the covers.

Q: Do I need a professional to fix my tail light wiring?

A: It depends on the severity of the issue. If you are comfortable working with electrical systems and have the necessary tools, you can troubleshoot and fix the wiring yourself. However, if you are not confident in your abilities or the issue is complex, it is best to seek the help of a professional auto electrician.

By following the troubleshooting steps outlined in this article, you can fix the wiring issue in your 1991 Chevy S10 and get your tail lights working properly again. Remember to stay safe and take the necessary precautions when working with electrical systems. Good luck!