Standard Ignition NS-139 Neutral Safety Switch

Neutral Safety Switch for Toyota and Lexus Applications

Standard Ignition NS-139 is a 12V neutral safety switch built for select Toyota, Lexus, and Mitsubishi applications with a bolt-mount design and a single rectangular female connector. It is used in automatic transmission starting circuits to help ensure the vehicle starts only in Park or Neutral.

Compatible With 1993-2004 Toyota Tacoma, Toyota 4Runner, Toyota Land Cruiser, Toyota Supra, Toyota T100, Toyota Previa, Lexus LS400, Lexus SC300, Lexus SC400, Lexus GS300, Lexus GS400, Lexus LX450, Lexus LX470, and select Mitsubishi Montero, Montero Sport, and Montero applications. Standard Ignition NS-139 is a direct-fit electrical switch for vehicles that require a 9-terminal blade-style neutral safety switch.

Key Features

• 12V neutral safety switch for automatic transmission starting circuits
• Bolt-mount attachment method for secure installation
• 1 female rectangular connector with 9 male blade terminals
• Metal construction with black, gray, and silver finish
• Approximate length: 5.1875 in. (131.7625 mm)
• Standard Ignition NS-139 part number for accurate replacement matching

Detailed Description

This neutral safety switch helps control starter engagement based on transmission position, making it an important electrical component for Toyota Tacoma, Toyota 4Runner, and Lexus LS400 starting systems. Standard Ignition NS-139 is built with a metal body, blade terminals, and a rectangular connector layout to match the original-style mounting and electrical interface used on listed vehicles. This part cross-references Anchor 8849 for the same application.

Common Problems It Can Help Resolve

• Engine will not crank in Park or Neutral
• Starter engages in the wrong gear position
• Intermittent no-start condition related to transmission range sensing
• Reverse or start circuit issues tied to a worn neutral safety switch
• Electrical connection problems at the transmission-mounted switch

Installation Notes and Tips

Verify connector style, terminal count, and transmission application before installation. This switch uses a bolt-mount design and does not include mounting hardware or gaskets. Confirm the vehicle is listed by year and model, including the 2001 Toyota 4Runner note to 7/00 and the 1994-1996 Toyota Previa Matsushita application, before replacing the original unit.

Quality Assurance

Standard Ignition supplies electrical replacement parts for OE-style service applications, and NS-139 is built to match the specified connector, terminal, and mounting requirements for the listed vehicles.