Standard Ignition NS-493 Neutral Safety Switch

Neutral Safety Switch for Nissan and INFINITI

Standard Ignition NS-493 is a 12V neutral safety switch built with a screw-in attachment method, a rectangular female connector, and 2 male blade terminals. It is a direct-fit electrical replacement for select Nissan and INFINITI applications, including Nissan GT-R, 370Z, Altima, 350Z, Sentra, Maxima, and INFINITI G35 and G37 models.

Key Features

• 12V neutral safety switch for automatic transmission starting circuit control
• Screw-in attachment method for secure installation
• 1 rectangular female connector with 2 male blade terminals
• Plastic and metal construction with black and silver finish
• Compact 1.5-inch (38.1 mm) length
• Standard Ignition NS-493 replacement part number

Detailed Description

Standard Ignition NS-493 is a neutral safety switch used in the vehicle starting interlock circuit, helping ensure the engine starts only when the transmission is in the proper range. This replacement switch is built for 12V systems and uses a screw-in design with a single rectangular connector, making it a practical service part for Nissan and INFINITI vehicles that require this style of switch. It cross-references Monroe Shocks & Struts (e.g., 172286) for the same application. Search terms such as Nissan GT-R neutral safety switch replacement, 2007-2010 Nissan Altima neutral safety switch, and INFINITI G35 G37 starting circuit switch replacement align with this part’s fitment.

What It Helps Fix

• Engine will not crank in Park or Neutral
• Intermittent no-start condition related to the transmission range circuit
• Starter engagement only in certain shifter positions
• Faulty neutral safety switch electrical signal
• Starting circuit issues on select Nissan and INFINITI models

Installation Notes and Tips

Verify connector style, terminal count, and screw-in mounting before installation. Match the original switch location and confirm the transmission is in the correct position during service. Because mounting hardware and gaskets are not listed, reuse existing service components only if they are in good condition and the application calls for them. Confirm fitment for your exact year, make, and model before ordering NS-493.

Quality Assurance

Standard Ignition supplies replacement electrical components for service applications, and NS-493 is built with aluminum, plastic, and metal materials for the specified fitment range. Compatible With 2000-2020 Nissan and INFINITI applications listed above, including Nissan GT-R, 370Z, Altima, 350Z, Sentra, Maxima, and INFINITI G35/G37 models.