Repair a damaged, corroded, or melted wiring connection with the Standard Ignition Carburetor Choke Thermostat Connector / Headlight Switch Connector S-663, a direct-fit electrical connector for a huge range of Ford, Lincoln, Mercury, Mazda, and Merkur applications from 1970 through 1998 — including the 1970-1996 Ford Bronco, 1985-1996 Ford F-150, 1970-1997 Ford F-250 and F-350, 1984-1995 Ford Mustang, 1984-1995 Lincoln Town Car, and 1984-1995 Mercury Cougar. See the Buyer's Guide tab for the full list of 69 applications.
This part carries two catalog names because it is used in both circuits depending on the vehicle, so it is listed as a Carburetor Choke Thermostat Connector and a Headlight Switch Connector.
- Plug-in interface: provides the mating connection point between the vehicle's wiring harness and the component.
- Dual application: serves as the choke thermostat connector or the headlight switch connector on the listed applications.
- Signs it may need replacing: corroded, broken, or heat-damaged terminals and intermittent or lost contact at the connection.
Diagnose the circuit before replacing to confirm the connector is the cause. Interchange: Manufacturer part number S-663 (also S663).
