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Standard Ignition NS-21 Neutral Safety Switch
| Brand | Standard Ignition NS-21 |
|---|---|
| Color | Black, Silver |
| Connector Gender | Male |
| Finish | Aluminum, Plastic |
| Mounting Type | Bolt Mount |
| Terminal Gender | Male |
| Terminal Type | Blade |
| Fits | Buick, Chevrolet, GMC, Oldsmobile, and Pontiac · 129 vehicles |
Bolt mount design. Installs securely with a single connector and blade terminals.
Copper alloy conductors. Deliver superior conductivity with low resistive losses.
100% tested. Verified for mechanical and electrical switching performance.
Cross-references 1S5180, 53-31576 and 19107005 for the same application. See all 7.
Neutral Safety Switch for GM Applications
Standard Ignition NS-21 is a neutral safety switch built for older GM vehicles that require reliable starter circuit control. It is a direct-fit electrical switch solution for select Chevrolet, Buick, Oldsmobile, and Pontiac models from 1977-1981, including Camaro, Caprice, Malibu, Monte Carlo, Firebird, Grand Prix, and more.
- Black and silver finish with aluminum and plastic construction
- Bolt-mount design for secure installation
- 1 male connector with 5 male blade terminals
- Built for neutral safety switch function in the starting circuit
- 100% tested for mechanical and electrical switching performance
- Copper alloy conductors for strong electrical conductivity and low resistive loss
Fitment and Application Details
Fits a wide range of GM rear-wheel-drive platforms, including 1977-1981 Chevrolet Camaro, 1977-1979 Chevrolet Caprice, 1977-1979 Chevrolet Impala, 1977-1979 Chevrolet Malibu, 1977-1979 Chevrolet Monte Carlo, 1978-1981 Chevrolet El Camino, 1977-1979 Buick LeSabre, 1977-1979 Buick Riviera, 1977-1979 Oldsmobile Cutlass, 1977-1979 Pontiac Grand Am, and 1979-1980 Pontiac Firebird. Additional coverage includes select 1980-1981 Chevrolet Malibu and Monte Carlo applications, plus 1981 Oldsmobile Cutlass, Delta 88, and Pontiac Grand Prix configurations with listed OE-number and console notes.
This part cross-references Standard Ignition NS17 and DR423 for the same application.
What This Switch Helps Resolve
- Engine cranking in gear
- No-start condition when the transmission is in Park or Neutral
- Intermittent starter engagement
- Faulty park/neutral signal to the starting circuit
- Electrical switching issues caused by worn internal contacts
Installation Notes
Verify the transmission and console configuration before ordering, since some listed applications require no console or specific OE-number matching. Confirm connector style, terminal count, and mounting location against the original part before installation. Standard Ignition NS-21 uses a bolt-mount design with blade terminals, so proper alignment and secure fastening are important for correct switch operation.
Quality Assurance
Standard Ignition builds this neutral safety switch with robust materials and copper alloy conductors, then tests each unit for mechanical and electrical performance. The design reflects long-term development focused on service-professional requirements and dependable circuit control.
| Year | Make | Model | Body Type | Transmission | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|---|
| 1981 | Chevrolet | Camaro | — | Automatic | — | — | N/A | Compatible with vehicles equipped with U.S. Emissions for Distributor Ignition Pickup. |
| 1981 | Chevrolet | Camaro | — | Automatic | — | — | N/A | Exc. Canada |
| 1981 | Chevrolet | Caprice | — | — | — | — | N/A | Compatible with vehicles equipped with U.S. Emissions for Distributor Ignition Pickup. |
| 1981 | Chevrolet | Caprice | — | — | — | — | N/A | Exc. Canada |
| 1981 | Chevrolet | El Camino | — | Automatic | — | — | N/A | Exc. Canada |
| 1981 | Chevrolet | Impala | — | Automatic | — | — | N/A | Exc. Canada |
| 1981 | Chevrolet | Malibu | — | Automatic | — | — | N/A | Exc. Canada |
| 1981 | Chevrolet | Malibu | — | Automatic | — | — | N/A | Compatible with vehicles equipped with U.S. Emissions for Distributor Ignition Pickup. |
| 1981 | Chevrolet | Monte Carlo | — | Automatic | — | — | N/A | Exc. Canada |
| 1981 | Chevrolet | Monte Carlo | — | Automatic | — | — | N/A | Compatible with vehicles equipped with U.S. Emissions for Distributor Ignition Pickup. |
| 1981 | Oldsmobile | Custom Cruiser | — | — | 5.0L | V8 | N/A | — |
| 1981 | Oldsmobile | Custom Cruiser | — | — | 5.7L | V8 | N/A | — |
| 1981 | Oldsmobile | Cutlass | — | Automatic | — | — | N/A | w/o Console; OE No. 1994201, 1994202, 1994221, 1994226 |
| 1981 | Oldsmobile | Cutlass Cruiser | — | — | 3.8L | V6 | N/A | — |
| 1981 | Oldsmobile | Cutlass Cruiser | — | — | 4.3L | V8 | N/A | — |
| 1981 | Oldsmobile | Cutlass Cruiser | — | — | 5.0L | V8 | N/A | — |
| 1981 | Oldsmobile | Cutlass Cruiser | — | — | 5.7L | V8 | N/A | — |
| 1981 | Oldsmobile | Cutlass Supreme | — | Automatic | — | — | N/A | w/o Console; OE No. 1994201, 1994202, 1994221, 1994226 |
| 1981 | Oldsmobile | Delta 88 | Sedan | Automatic | — | — | N/A | OE No. 1994201, 226, 229; 3 Pin |
| 1981 | Pontiac | Bonneville | — | Automatic | — | — | N/A | w/o Console |
| 1981 | Pontiac | Bonneville | — | Automatic | — | — | N/A | — |
| 1981 | Pontiac | Catalina | — | — | — | — | N/A | OE No. 1994201, 1994202, 1994221, 1994226, 1994229 |
| 1981 | Pontiac | Firebird | — | — | — | — | N/A | OE No. 1994201, 1994202, 1994221, 1994226, 1994229 |
| 1981 | Pontiac | Grand LeMans | — | Automatic | — | — | N/A | w/o Console |
| 1981 | Pontiac | Grand Prix | — | Automatic | — | — | N/A | w/o Console; OE No. 1994201, 1994202, 1994221, 1994226, 1994229 |
| 1981 | Pontiac | LeMans | — | Automatic | — | — | N/A | w/o Console |
| 1981 | Pontiac | Parisienne | — | Automatic | — | — | N/A | w/o Console |
| 1981 | Pontiac | Phoenix | — | Automatic | — | — | N/A | OE No. 1994201, 1994202, 1994221, 1994226 |
| 1980 | Chevrolet | Camaro | — | Automatic | — | — | N/A | — |
| 1980 | Chevrolet | Citation | — | Automatic | — | — | N/A | — |
| 1980 | Chevrolet | El Camino | — | Automatic | — | — | N/A | — |
| 1980 | Chevrolet | Malibu | — | Automatic | — | — | N/A | Exc. Canada |
| 1980 | Chevrolet | Monte Carlo | — | Automatic | — | — | N/A | Exc. Canada |
| 1980 | Oldsmobile | 98 | — | — | — | — | N/A | OE No. 1994201, 1994202, 1994221, 1994226 |
| 1980 | Oldsmobile | Custom Cruiser | — | Automatic | — | — | N/A | — |
| 1980 | Oldsmobile | Cutlass Cruiser | — | — | — | — | N/A | — |
| 1980 | Oldsmobile | Delta 88 | Sedan | Automatic | — | — | N/A | 3 Pin |
| 1980 | Oldsmobile | Omega | — | Automatic | — | — | N/A | w/ Console |
| 1980 | Oldsmobile | Starfire | — | Automatic | — | — | N/A | — |
| 1980 | Pontiac | Bonneville | — | Automatic | — | — | N/A | w/o Console |
| 1980 | Pontiac | Catalina | — | Automatic | — | — | N/A | w/o Console |
| 1980 | Pontiac | Firebird | — | Automatic | — | — | N/A | — |
| 1980 | Pontiac | Grand LeMans | — | Automatic | — | — | N/A | w/o Console |
| 1980 | Pontiac | Grand Prix | — | Automatic | — | — | N/A | w/o Console |
| 1980 | Pontiac | LeMans | — | Automatic | — | — | N/A | w/o Console |
| 1980 | Pontiac | Parisienne | — | Automatic | — | — | N/A | w/o Console |
| 1980 | Pontiac | Phoenix | — | Automatic | — | — | N/A | OE No. 1994201, 1994202, 1994221, 1994226 |
| 1980 | Pontiac | Phoenix | — | Automatic | — | — | N/A | — |
| 1979 | Buick | Century | — | Automatic | — | — | N/A | w/o Power Door Locks |
| 1979 | Buick | LeSabre | — | — | — | — | N/A | — |
| 1979 | Buick | Riviera | — | — | — | — | N/A | — |
| 1979 | Chevrolet | Camaro | — | — | 4.1L | L6 | N/A | — |
| 1979 | Chevrolet | Camaro | — | — | 5.0L | V8 | N/A | — |
| 1979 | Chevrolet | Camaro | — | — | 5.7L | V8 | N/A | — |
| 1979 | Chevrolet | Camaro | — | — | — | — | N/A | — |
| 1979 | Chevrolet | Caprice | — | — | — | — | N/A | — |
| 1979 | Chevrolet | El Camino | — | Automatic | — | — | N/A | — |
| 1979 | Chevrolet | El Camino | — | — | — | — | N/A | — |
| 1979 | Chevrolet | Impala | — | — | 4.1L | L6 | N/A | — |
| 1979 | Chevrolet | Impala | — | — | 5.0L | V8 | N/A | — |
| 1979 | Chevrolet | Impala | — | — | 5.7L | V8 | N/A | — |
| 1979 | Chevrolet | Malibu | — | Automatic | — | — | N/A | — |
| 1979 | Chevrolet | Malibu | — | — | — | — | N/A | — |
| 1979 | Chevrolet | Monte Carlo | — | Automatic | — | — | N/A | — |
| 1979 | Chevrolet | Monte Carlo | — | — | — | — | N/A | — |
| 1979 | Oldsmobile | 98 | — | — | — | — | N/A | — |
| 1979 | Oldsmobile | Custom Cruiser | — | — | 6.6L | V8 | N/A | — |
| 1979 | Oldsmobile | Custom Cruiser | — | — | 5.7L | V8 | N/A | — |
| 1979 | Oldsmobile | Cutlass | — | — | — | — | N/A | — |
| 1979 | Oldsmobile | Cutlass Salon | — | — | — | — | N/A | — |
| 1979 | Oldsmobile | Cutlass Supreme | — | — | — | — | N/A | — |
| 1979 | Oldsmobile | Delta 88 | — | — | — | — | N/A | — |
| 1979 | Oldsmobile | Toronado | — | — | — | — | N/A | 3 Pin |
| 1979 | Pontiac | Bonneville | — | — | — | — | N/A | — |
| 1979 | Pontiac | Catalina | — | — | — | — | N/A | — |
| 1979 | Pontiac | Firebird | — | — | — | — | N/A | — |
| 1979 | Pontiac | Firebird | — | — | 3.8L | V6 | N/A | — |
| 1979 | Pontiac | Firebird | — | — | 4.9L | V8 | N/A | — |
| 1979 | Pontiac | Firebird | — | — | 5.0L | V8 | N/A | — |
| 1979 | Pontiac | Firebird | — | — | 5.7L | V8 | N/A | — |
| 1979 | Pontiac | Firebird | — | — | 6.6L | V8 | N/A | — |
| 1979 | Pontiac | Grand Am | — | — | 3.8L | V6 | N/A | — |
| 1979 | Pontiac | Grand Am | — | — | 4.9L | V8 | N/A | — |
| 1979 | Pontiac | Grand Am | — | — | 5.0L | V8 | N/A | — |
| 1979 | Pontiac | Grand LeMans | — | Automatic | — | — | N/A | w/o Console |
| 1979 | Pontiac | Grand Prix | — | — | — | — | N/A | — |
| 1979 | Pontiac | LeMans | — | Automatic | — | — | N/A | w/o Console |
| 1978 | Buick | Century | — | Automatic | — | — | N/A | w/o Power Door Locks |
| 1978 | Buick | LeSabre | — | Automatic | — | — | N/A | w/o Auto Door Lock |
| 1978 | Buick | LeSabre | — | — | — | — | N/A | — |
| 1978 | Buick | Riviera | — | — | — | — | N/A | — |
| 1978 | Chevrolet | Caprice | — | — | — | — | N/A | — |
| 1978 | Chevrolet | El Camino | — | Automatic | — | — | N/A | — |
| 1978 | Chevrolet | El Camino | — | — | — | — | N/A | — |
| 1978 | Chevrolet | Impala | — | — | 4.1L | L6 | N/A | — |
| 1978 | Chevrolet | Impala | — | — | 5.0L | V8 | N/A | — |
| 1978 | Chevrolet | Impala | — | — | 5.7L | V8 | N/A | — |
| 1978 | Chevrolet | Malibu | — | Automatic | — | — | N/A | — |
| 1978 | Chevrolet | Monte Carlo | — | Automatic | — | — | N/A | — |
| 1978 | Chevrolet | Monte Carlo | — | — | — | — | N/A | — |
| 1978 | Oldsmobile | 98 | — | — | — | — | N/A | — |
| 1978 | Oldsmobile | Custom Cruiser | — | — | 6.6L | V8 | N/A | — |
| 1978 | Oldsmobile | Custom Cruiser | — | — | 5.7L | V8 | N/A | — |
| 1978 | Oldsmobile | Cutlass | — | — | — | — | N/A | — |
| 1978 | Oldsmobile | Cutlass Salon | — | — | — | — | N/A | — |
| 1978 | Oldsmobile | Cutlass Supreme | — | — | — | — | N/A | — |
| 1978 | Oldsmobile | Delta 88 | Sedan | Automatic | — | — | N/A | 3 Pin |
| 1978 | Oldsmobile | Toronado | — | Automatic | — | — | N/A | 3 Pin |
| 1978 | Pontiac | Bonneville | — | — | — | — | N/A | — |
| 1978 | Pontiac | Catalina | — | — | — | — | N/A | — |
| 1978 | Pontiac | Grand Am | — | — | 4.9L | V8 | N/A | — |
| 1978 | Pontiac | Grand Am | — | — | 5.0L | V8 | N/A | — |
| 1978 | Pontiac | Grand LeMans | — | Automatic | — | — | N/A | w/o Console |
| 1978 | Pontiac | Grand Prix | — | — | — | — | N/A | — |
| 1978 | Pontiac | LeMans | — | Automatic | — | — | N/A | w/o Console |
| 1977 | Buick | Century | — | — | — | — | N/A | — |
| 1977 | Buick | LeSabre | — | — | — | — | N/A | — |
| 1977 | Buick | Riviera | — | — | 5.7L | V8 | N/A | — |
| 1977 | Buick | Riviera | — | — | 6.6L | V8 | N/A | — |
| 1977 | Chevrolet | Caprice | — | — | — | — | N/A | — |
| 1977 | Chevrolet | Impala | — | — | — | — | N/A | — |
| 1977 | Chevrolet | Malibu | — | — | — | — | N/A | — |
| 1977 | Chevrolet | Monte Carlo | — | — | — | — | N/A | — |
| 1977 | Oldsmobile | Cutlass | — | — | — | — | N/A | — |
| 1977 | Oldsmobile | Toronado | — | Automatic | — | — | N/A | 3 Pin |
| 1977 | Pontiac | Bonneville | — | — | — | — | N/A | — |
| 1977 | Pontiac | Catalina | — | — | — | — | N/A | — |
| 1977 | Pontiac | Grand LeMans | — | Automatic | — | — | N/A | w/o Console |
| 1977 | Pontiac | LeMans | — | Automatic | — | — | N/A | w/o Console |
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