1986 Jeep CJ7 Wiring Diagram: A Comprehensive Guide

Jeep CJ7 has been an iconic vehicle and remains popular among enthusiasts even after being discontinued. This 4-wheel drive vehicle was produced from 1976 to 1986, and the 1986 Jeep CJ7 is considered to be one of the best models of the series. However, with the passing years, the wiring of the vehicle can become faulty, leading to a range of problems. In this article, we will discuss the wiring diagram of the 1986 Jeep CJ7 and provide you with a comprehensive guide to help you troubleshoot the wiring problems.

What is a Wiring Diagram?

A wiring diagram is a schematic representation of the electrical system of a vehicle. It provides a visual representation of the electrical components and how they are connected to each other. The wiring diagram is a crucial tool for any vehicle owner as it helps them understand the electrical system of their vehicle and troubleshoot any issues that may arise.

Why Do You Need a Wiring Diagram for Your Jeep CJ7?

As your Jeep CJ7 gets older, the wiring system can become corroded and damaged due to exposure to the environment, use, and time. This can lead to problems with your vehicle’s electrical components, including the lights, engine, and other systems. A wiring diagram can help you identify the problem and locate the faulty wiring, so you can repair or replace it.

The 1986 Jeep CJ7 Wiring Diagram

The 1986 Jeep CJ7 wiring diagram consists of various electrical components that are connected to each other via wires. The electrical components include the battery, starter, alternator, ignition switch, distributor, lights, and various sensors. The wiring diagram provides a detailed illustration of how these components are connected to each other, including the color codes and wire sizes.

Understanding the Wiring Diagram

Before you start troubleshooting the wiring of your Jeep CJ7, it’s essential to understand the wiring diagram. You need to familiarize yourself with the components, their location, and how they are connected. The wiring diagram consists of illustrations, symbols, and wire color codes that represent each electrical component.

The Symbols Used in the Wiring Diagram

The wiring diagram uses various symbols to represent different electrical components. Here is a list of some of the common symbols used in the wiring diagram:

Symbol Description
Battery A source of electrical power
Ground Represents a connection to the vehicle body or frame
Ignition switch A switch that controls the engine’s ignition system
Light Represents a vehicle light, such as headlight, taillight, or turn signal
Starter A component that activates the engine’s flywheel to start the engine
Sensor Represents a variety of sensors that are used to monitor various systems in the vehicle, such as the engine oil pressure, temperature, or oxygen level.

Wire Color Codes Used in the Wiring Diagram

The wiring diagram also uses various wire color codes to indicate the function of each wire. Here is a list of some of the common wire color codes used in the wiring diagram:

Wire Color Description
Black Ground wire
Red Power wire
Yellow Ignition wire
Green Temperature sensor wire
Blue Oil pressure sensor wire
White Lighting wire

How to Troubleshoot the Wiring of Your 1986 Jeep CJ7

If you’re experiencing issues with your 1986 Jeep CJ7, such as faulty lights, engine problems, or other electrical issues, you can troubleshoot the wiring using the wiring diagram. Here’s a step-by-step guide:

Step 1: Gather Your Tools and Supplies

You will need a few tools and supplies to troubleshoot the wiring of your Jeep CJ7. You should have a set of pliers, wire cutters, a multimeter, a soldering iron, shrink tubing, and electrical tape on hand.

Step 2: Locate the Problem

The first step is to locate the problem. Using the wiring diagram, you can identify the component that’s causing the issue. Check the wirings and connectors for any visible damages or corrosion. Some common issues include faulty fuses, loose connectors, and worn-out wires.

Step 3: Test the Circuit

Using a multimeter, you can test the circuit and check for any open or short circuits. Start by testing the voltage of the battery and make sure it’s within the specified range. Then, check the voltage of each electrical component to see if they’re getting the correct voltage supply. If you find a circuit with a low voltage, you may need to replace the wiring or the component.

Step 4: Repair the Wiring

Once you’ve identified the problem and located the faulty wiring, you need to repair or replace it. Start by cutting the damaged section of the wire and stripping both ends. Then, solder the replacement wire and wrap it with shrink tubing. Finally, use electrical tape to secure the repair.

Frequently Asked Questions (FAQs)

What is a Jeep CJ7?

A Jeep CJ7 is a 4-wheel drive vehicle produced by Jeep from 1976 to 1986. It was the successor to the Jeep CJ5 and was known for its off-road capabilities and ruggedness.

What are the most common wiring issues in a Jeep CJ7?

The most common wiring issues in a Jeep CJ7 are corrosion, broken wires, loose connections, and blown fuses. These issues can cause a range of electrical problems, including faulty lights, engine problems, and other issues.

Where can I find a wiring diagram for my 1986 Jeep CJ7?

You can find a wiring diagram for your 1986 Jeep CJ7 in the owner’s manual or online. There are several websites that offer wiring diagrams for various vehicles, including the Jeep CJ7.

Can I troubleshoot the wiring of my Jeep CJ7 without a wiring diagram?

It’s possible to troubleshoot the wiring of your Jeep CJ7 without a wiring diagram, but it’s not recommended. The wiring diagram provides a detailed illustration of the electrical system and helps you identify the components and their connections. It’s an essential tool for troubleshooting any wiring issues in your vehicle.

Can I repair the wiring of my Jeep CJ7 myself?

Yes, you can repair the wiring of your Jeep CJ7 yourself if you have the tools and knowledge. However, if you’re not confident in your abilities, it’s best to take it to a professional mechanic who specializes in electrical systems.


The 1986 Jeep CJ7 is a classic vehicle that remains popular among 4-wheel drive enthusiasts. However, the wiring system of the vehicle can become faulty, leading to a range of electrical problems. A wiring diagram is a crucial tool for troubleshooting any wiring issues in your Jeep CJ7. By following the steps outlined in this article, you can repair the faulty wiring and keep your vehicle running smoothly for years to come.