Keep the starter locked out unless the transmission is in Park or Neutral with the Standard Ignition Neutral Safety Switch NS-54. This direct-fit replacement covers a wide range of listed applications, including the 1986-1997 Ford Aerostar, 1980-1989 Ford Mustang, 1985-1994 Ford Ranger, 1981-1990 and 1992-1993 Ford F-150, 1991-1994 Ford Explorer, 1984-1989 Lincoln Mark VII, 1980-1986 Mercury Cougar, and the 1989 Merkur XR4Ti — see the Buyer's Guide tab for the complete vehicle list.
A neutral safety switch signals the vehicle's control circuit to allow the engine to crank only when the shifter is in Park or Neutral, and on many applications it also controls the backup lamp circuit. If a worn or failed switch is why the engine won't start in Park, cranks in gear, or the reverse lights don't work, this replaces it. Diagnose the cause before replacing.
Interchange: S9194 · F409 · NS6530 · D6RY7A247B · SW1391
This part cross-references / interchanges with the following part numbers:
What does the NS-54 neutral safety switch do?
It signals the starting circuit to let the engine crank only when the transmission is in Park or Neutral. On many applications it also controls the backup lamp circuit.
What are signs my neutral safety switch may need replacing?
Common signs include the engine not cranking in Park or Neutral, cranking while in gear, or backup lights not working. Diagnose the cause first, since other components can produce these symptoms.
Will this switch fit my vehicle?
The NS-54 is a direct-fit replacement for many listed Ford, Lincoln, Mercury, and Merkur models. Check the Buyer's Guide tab to confirm your exact year, make, and model.
What numbers does the NS-54 interchange with?
It replaces S9194, F409, NS6530, D6RY7A247B, and SW1391. Matching a number you already have helps confirm the correct part.
Is the NS-54 tested before it ships?
Yes. Standard Ignition states each unit is 100% tested to verify both mechanical and electrical switching performance, with quality control from componentry to finished product.
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.
