Standard Ignition US-343 Ignition Switch

Ignition Switch for GM and Isuzu Applications

The Standard Ignition US-343 ignition switch is built for direct replacement service in select Chevrolet, GMC, Oldsmobile, and Isuzu vehicles. It uses a snap-fit attachment, a column mounting location, and a 13-blade terminal layout to support proper electrical switching and reliable fitment.

Fits 2000-2005 Chevrolet Blazer, 2000-2005 GMC Jimmy, 2003-2004 Chevrolet S10, 2000-2004 GMC Sonoma, 2000-2002 Chevrolet S10, 2000-2001 Oldsmobile Bravada, and 2000 Isuzu Hombre. This part number, US-343, is a practical choice when replacing a worn or failing ignition switch in these applications.

Key Features

• Standard Ignition US-343 ignition switch for column-mounted applications
• Snap-fit attachment method for direct replacement service
• Gray plastic finish with one rectangular male connector
• 13 female blade terminals for the specified electrical interface
• Copper alloy conductors for strong electrical conductivity and reduced resistance
• 100% tested for mechanical and electrical switching performance

Detailed Description

Standard Ignition designs this ignition switch with durable materials and a service-focused construction to meet the demands of everyday repair work. The copper alloy conductor design supports consistent current flow, while the tested switching performance helps confirm proper operation before installation. The US-343 is engineered for vehicles that use a column-mounted ignition switch with the listed connector and terminal configuration.

Cross-reference part numbers for the same application include 1S5973 and CS658. This ignition switch is commonly searched as a replacement for Chevrolet Blazer ignition switch, GMC Jimmy ignition switch, and GMC Sonoma ignition switch applications.

Common Problems It Can Help Solve

• Intermittent no-start condition caused by a failing ignition switch
• Accessory or ignition circuits that do not power on correctly
• Key position issues such as inconsistent crank or run operation
• Electrical switching faults from worn internal contacts
• Starting problems related to damaged switch terminals or connector wear

Installation Notes and Tips

Verify the column-mounted switch style, connector shape, terminal count, and vehicle year before installation. Confirm left-hand drive or right-hand drive notes where listed, since fitment differs for some Chevrolet Blazer and GMC Jimmy applications. Match the existing connector and blade-terminal layout to the US-343 before final assembly.

Quality Assurance

Standard Ignition states that this switch is built from high-grade materials and tested for both mechanical and electrical performance. That focus on material quality and functional verification supports dependable replacement service for GM and Isuzu ignition switch applications.