The voltage regulator in your vehicle is typically attached to the firewall or inner fender well inside of the engine bay. It is usually a black or silver box with several wires connected to it, and is about 2-3 inches in diameter.
To locate the voltage regulator in a 1965 Ford Thunderbird, follow these steps:
Open the hood of your vehicle.
Look at the firewall on the passenger side of the engine bay.
Locate the black or silver box with several wires connected to it, near the base of the firewall.
If you cannot find the voltage regulator, you can refer to your vehicle's repair manual for its specific location.