Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Description & Operation: Notes
All direction signal systems are similar in design and operate in the same manner except that various types of indicator circuits are used. See typical wiring diagrams below. Power source for the flasher is usually the "IGN" or "ACC" terminal of the ignition switch so that the direction signals are operative only with the ignition turned on. A fuse or circuit breaker is connected in this power source line to protect the direction signal circuits.
COUGAR & THUNDERBIRD TURN SIGNAL NOTE: For Thunderbird and Cougar "Sequential" turn signals, see "Ford Motor Co. Sequential Turn Signals".
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.