In a 1966 Mustang, the four-way flasher unit isn't located in a readily accessible place like a fuse box. It's typically
under the dashboard, often tucked away near the steering column. You'll likely need to remove some trim panels or possibly even parts of the dashboard itself to access it. It might be mounted to a bracket or simply clipped in place.
There's no single definitive location; its exact placement can vary slightly depending on the specific model and any modifications made to the car over the years. Consulting a 1966 Mustang wiring diagram or shop manual will give you the most accurate location for your specific vehicle.
