If you are restoring a 1967 Mustang, one of the most important systems to check is the windshield wiper system. It is mandatory to have a well-functioning wiper motor in place since a worn-out or faulty system can be dangerous when driving in rainy or snowy conditions.
Understanding the Wiring Diagram
The wiper motor system consists of a few components; wiper switch, wiper motor, and washer pump. These three systems are interconnected by a series of wires that allow current to flow through them. Understanding the wiring diagram is essential when repairing or replacing any of these components.
There are two types of wiring diagrams that you can use when working on your Mustang; a schematic diagram and a pictorial diagram. The schematic diagram shows the wiring path without any graphic representation of the components, while the pictorial diagram shows the graphical representation of the components.
Regardless, both of these diagrams show the way in which current flows through the system. The wiring diagram uses a simple code to represent wires, switches, and motors:
- Power wires are represented with a red line.
- Ground wires are represented by a black line.
- Switches are represented by square boxes.
- Electric motors are represented by circles.
Wiper Switch Wiring Diagram
The wiper switch is usually located on the dashboard and controls the wiper motor by completing the electrical circuit. The wiper switch has three different positions:
- Low speed
- High speed
- Off position
To control the slow speed position, the wiper switch uses a resistor that reduces the voltage going to the motor.
Wiper Motor Wiring Diagram
The wiper motor is responsible for controlling the wiper blades’ movement. The wiper motor has two wires that connect to the battery terminals, a ground wire, and two control wires. The two control wires are the Red/Light Blue and the Dark Blue wires.
The Red/Light Blue wire provides power to the wiper motor. When this wire is energized, the wiper motor will turn on. On the other hand, the Dark Blue wire controls the park function of the wiper motor. When the switch is in the off position, the wiper motor will return to its park position.
Washer Pump Wiring Diagram
The washer pump is responsible for spraying the windshield with washer fluid. The washer pump is controlled by the switch located on the dashboard. The washer pump motor has two wires that connect to the toggle switch.
The Dark Green/Yellow wire is permanently grounded, while the Dark Green/Red wire provides power to the washer pump. When the toggle switch is activated, power is sent to the Dark Green/Red wire, and the washer pump will turn on.
Frequently Asked Questions
1. How do I know if my wiper motor is faulty?
If your wiper motor isn’t functioning, it is possible that the motor itself is not the issue. Check if there’s a blown fuse or a broken wire in the wiper circuit. If everything is in order, the wiper motor needs to be examined to see if there’s any visible damage or if its internal components are worn out.
2. What should I do if my wipers aren’t working?
Inspect the wiring and the switch to make sure that there’s no damage, corrosion, or broken wires. If everything is in good condition, there could be an issue with the motor itself. Have a professional mechanic examine the motor to determine the cause of the issue.
3. How do I replace the wiper motor in my 1967 Mustang?
To replace the wiper motor in your 1967 Mustang, you need to disconnect the battery and remove the windshield wiper arms. Then, remove the cowl panel and the wiper motor assembly’s mounting bolts. Disconnect the wiring harness from the motor, remove the motor from the assembly, and replace it with a new one. Connect the wiring harness, reattach the mounting bolts, and reinstall the cowl panel and the wiper arms.
| Wire Color | Function |
|---|---|
| Red/Light Blue | Provide Power to Wiper Motor |
| Dark Blue | Control Park Function of Wiper Motor |
| Dark Green/Yellow | Ground Wire for Washer Pump |
| Dark Green/Red | Control Washer Pump Function |
