Give your key a solid connection to the ignition and starter circuits with the Standard Ignition Ignition Starter Switch, part number US-74, the switch that sends power to the ignition and engages the starter when the key is turned. It fits many vehicles, among them the 1961-1966 Ford F-250, 1964-1966 Ford Mustang and 1966-1977 Ford Bronco, as a direct-fit replacement for the listed applications. See the Buyer's Guide tab for the full list.
The ignition starter switch sits in the circuit that powers the ignition system and energizes the starter when the key is turned. Signs it may need replacing include an engine that won't crank when the key is turned, intermittent loss of power to the ignition or accessories, or stalling while driving. These symptoms can have other causes, so diagnose the circuit first. If a worn switch is the cause, the US-74 replaces it.
Interchange: CS52 · LS416 · KS6523 · C0LF11572A · C3AB11572A · C3AB11572B · C3AZ11572A · C7UB11572A · C7UZ11572A · C7ZZ15520A · C7ZZ15520C
This part cross-references / interchanges with the following part numbers:
What does the US-74 ignition starter switch do?
It sends battery power to the ignition circuit and engages the starter when the key is turned to start. It then keeps the ignition powered while the engine runs.
Is the US-74 the right Mustang switch for a 1964-1966 Ford Mustang?
Yes. The US-74 is listed as a direct-fit ignition starter switch for the 1964-1966 Ford Mustang. See the Buyer's Guide tab for every listed application.
Does this switch fit the Ford F-250 or Ford Bronco?
It is listed for the 1961-1966 Ford F-250 and the 1966-1977 Ford Bronco, among many other vehicles. The Buyer's Guide tab has the full list.
How is this ignition switch built and tested?
It uses copper alloy conductors for superior electrical conductivity with low resistive losses. Every switch is 100% tested for both mechanical and electrical switching performance.
What are signs an ignition switch may need replacing?
Common signs include no crank when the key is turned, intermittent power loss to the ignition or accessories, and stalling. These can have other causes, so diagnose the circuit before replacing the switch.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
