If you are restoring or modifying a 1968 GTO, having a reliable wiring diagram is crucial. The wiring in a car can be confusing, especially in older models with complex systems. A diagram can help you identify wires and components, troubleshoot electrical problems, and make modifications with confidence. In this article, we will provide a detailed overview of the 1968 GTO wiring diagram, including tables and FAQs to help you understand the system.
Overview of the Wiring Diagram
The 1968 GTO wiring diagram is organized into three main sections: engine and front lighting, rear lighting, and interior wiring. Each section is broken down into individual circuits, which are labeled with a circuit number and color code. The diagram shows the connections between components, including switches, sensors, relays, and fuses. It also indicates the wire size, splice locations, and terminal numbers.
The wiring diagram is designed to be used in conjunction with the electrical assembly manual, which provides more detailed information about specific components and procedures. If you don’t have access to the assembly manual, there are a few online resources that may be helpful, such as forums and enthusiast websites.
Engine and Front Lighting
The engine and front lighting section of the 1968 GTO wiring diagram includes circuits for the starter, alternator, ignition, headlights, horn, and other components. One of the key features of this section is the detailed diagram of the engine harness, which shows the routing of the wires from the engine compartment to the dash and fuse box. This can be especially helpful if you are installing an aftermarket engine or modifying the wiring for performance purposes.
Another important circuit in this section is the charging system, which includes the alternator, voltage regulator, and battery. The wiring for the charging system can be complex, so it’s important to follow the diagram carefully and test each component to ensure proper operation.
The front lighting circuits include the headlights, parking lights, and turn signals. These circuits are designed to work together, so it’s important to understand how they are connected and how to troubleshoot problems. The wiring diagram provides color codes and terminal numbers for each wire, which can help you identify them in the car.
Rear Lighting
The rear lighting section of the 1968 GTO wiring diagram covers the circuits for the taillights, brake lights, reverse lights, and license plate lights. This section also includes the wiring for the rear window defroster, if equipped. Like the front lighting circuits, the rear lighting circuits are color-coded and labeled with terminal numbers.
One common problem with the rear lighting circuits in older cars is corrosion and loose connections. If your taillights or brake lights aren’t working, it’s worth checking the wiring and connectors for signs of damage or wear. The wiring diagram can help you locate the appropriate components and test them using a multimeter or other electrical tester.
Interior Wiring
The interior wiring section of the 1968 GTO wiring diagram covers the circuits for the dash, console, radio, and other accessories. This section includes the wiring for the gauges, heater controls, and interior lights. It also includes the wiring for the optional power windows, locks, and seats.
One of the challenges of working with interior wiring is finding a way to route the wires without damaging the upholstery or trim. The wiring diagram can help you plan your route and identify any potential obstacles or pinch points. It’s also important to use the correct wire size and connectors to ensure a reliable connection.
FAQs
| Question | Answer |
|---|---|
| What size wire should I use for the alternator? | The alternator wire should be at least 10 gauge. |
| How do I test a relay? | You can test a relay by applying voltage to the coil terminals and measuring the resistance across the contact terminals with a multimeter. |
| What is the purpose of the voltage regulator? | The voltage regulator controls the output of the alternator to prevent overcharging of the battery. |
| Can I use modern LED lights with the original wiring? | It is generally not recommended to use modern LED lights with the original wiring, as the lower resistance of the LEDs can cause the circuits to overload and fail. |
| How do I know if a fuse is blown? | You can test a fuse with a multimeter or by visually inspecting the filament for signs of damage or discoloration. |
Overall, the 1968 GTO wiring diagram is a valuable resource for anyone working on a restoration or modification project. It provides a detailed overview of the car’s electrical system and can help you diagnose and fix problems with confidence. By following the wiring diagram carefully and using the appropriate tools and techniques, you can ensure that your GTO is reliable and safe on the road.
