Standard Ignition NS-139 Neutral Safety Switch

Overview of Standard Ignition Neutral Safety Switch NS-139

The Standard Ignition NS-139 Neutral Safety Switch is designed for reliable electrical performance in select Lexus, Mitsubishi, and Toyota vehicles. This bolt-mount switch ensures proper starting system operation by preventing engine start in gear, enhancing vehicle safety.

• Compatible with Lexus GS300, GS400, LS400, LX450, LX470, SC300, SC400
• Fits Toyota 4Runner, Land Cruiser, Supra, T100, Tacoma, Previa
• Also compatible with Mitsubishi Montero and Montero Sport models
• Features 9 male blade terminals and 1 female rectangular connector
• Constructed from durable metal with aluminum and plastic finish
• Measures approximately 5.19 inches (131.76 mm) in length
• 12-volt electrical rating with bolt mount attachment method

Detailed Product Features and Specifications

The NS-139 neutral safety switch from Standard Ignition is engineered with a bolt mount design for secure installation. It includes nine male blade terminals and a single female rectangular connector, facilitating straightforward electrical connections. The switch’s metal construction with aluminum and plastic finishes provides durability and resistance to wear. Measuring just over five inches in length, it fits precisely within the designated mounting area of compatible Lexus, Mitsubishi, and Toyota models. This 12-volt switch is essential for controlling the vehicle’s starting circuit, ensuring the engine only starts when the transmission is in neutral or park.

Applications and Common Issues Addressed

• Prevents engine from starting in gear, enhancing safety
• Resolves intermittent or no-start conditions related to faulty neutral safety switches
• Eliminates issues with starter engagement in Lexus GS300, Toyota Tacoma, and Mitsubishi Montero
• Corrects electrical faults causing starter relay malfunctions
• Restores proper transmission range sensor function in affected vehicles

Installation Notes and Tips

• Ensure vehicle is in park or neutral before beginning installation
• Use appropriate tools for bolt mount removal and installation
• Verify connector orientation matches the female rectangular connector on the switch
• Check all blade terminals for secure and corrosion-free connections
• Mounting hardware is not included; retain original bolts or source compatible replacements

Quality Assurance and Warranty Information

Standard Ignition parts are manufactured to meet or exceed OEM specifications for fit, form, and function. The NS-139 neutral safety switch undergoes rigorous quality control to ensure reliable operation in Lexus, Mitsubishi, and Toyota vehicles. While mounting hardware and gaskets are not included, the switch’s durable metal and plastic construction supports long-term use. Warranty coverage details should be confirmed with the parts provider or vehicle manufacturer.