Standard Ignition NS-27 Neutral Safety Switch

Neutral Safety Switch for Ford and Mercury

Standard Ignition NS-27 is a neutral safety switch built for service replacement on a range of Ford and Mercury vehicles from the late 1970s through the mid-1980s. It uses a female connector, a single connector interface, and four male blade terminals for direct electrical switching performance.

Key Features

• Neutral safety switch for automatic transmission start-circuit control
• Female connector with 1 connector interface
• 4 male blade terminals for secure electrical connection
• Copper alloy conductors for low-resistance current flow
• 100% tested for mechanical and electrical switching performance
• Standard Ignition NS-27 service replacement part

Detailed Description

Standard Ignition NS-27 is engineered with a robust housing and high-grade materials to meet the demands of professional repair work. Copper alloy conductors help maintain strong electrical conductivity, while full testing verifies switching action and circuit performance before the part leaves production. This neutral safety switch is used on applications including Ford Mustang, Ford Thunderbird, Ford LTD, Ford Ranger, Ford Bronco II, Mercury Capri, Mercury Cougar, Mercury Marquis, Mercury Zephyr, and Mercury Grand Marquis.

This part cross-references NGK 51287 for the same application. The NS-27 part number is also commonly searched for Ford Mustang and Mercury Cougar neutral safety switch replacement needs.

What It Helps Fix

• Engine cranks only in the wrong gear position
• No-crank condition when the transmission is in Park or Neutral
• Intermittent starter engagement caused by worn switch contacts
• Reverse or start-circuit switching faults tied to the transmission selector
• Electrical continuity issues at the neutral safety switch connector

Installation Notes and Tips

Verify connector style, terminal layout, and transmission application before installation. This NS-27 uses a female connector with four male blade terminals, so matching the harness and switch indexing is important for proper operation. Confirm vehicle fitment by year and model before service, especially on Ford Mustang, Mercury Capri, and other listed applications.

• Fits 1979-1986 Ford Mustang
• Fits 1980-1987 Ford Thunderbird
• Fits 1983-1986 Ford LTD
• Fits 1983-1984 Ford Ranger
• Fits 1984 Ford Bronco II
• Fits 1979-1986 Mercury Capri
• Fits 1980-1986 Mercury Cougar
• Fits 1981-1982 Mercury Marquis, Compact
• Fits 1983-1986 Mercury Marquis
• Fits 1981 Mercury Marquis
• Fits 1981 Mercury Grand Marquis
• Fits 1979-1983 Mercury Fairmont
• Fits 1979-1983 Mercury Zephyr

Quality Assurance

Standard Ignition backs this neutral safety switch with a design focused on technician needs, using durable materials and tested electrical performance for dependable service replacement.