Standard Ignition US-331 Ignition Switch

Ignition Switch for GM and Hummer Applications

Standard Ignition US-331 is a column-mounted ignition switch built for direct replacement service on a wide range of GM trucks, SUVs, and vans. It uses a snap-fit attachment, a single rectangular female connector, and 7 male blade terminals to support proper electrical switching in the ignition circuit.

Key Features

• Column-mounted ignition switch with snap-fit attachment
• Black and gray plastic finish for OE-style fit and appearance
• 1 rectangular female connector with 7 male blade terminals
• Copper alloy conductors for strong electrical conductivity and reduced resistance
• 100% tested for mechanical and electrical switching performance
• Fits 2003-2011 Chevrolet Express 1500, w/ Lock Cyl. Control Solenoid
• Fits 2003-2011 Chevrolet Express 2500, w/ Lock Cyl. Control Solenoid
• Fits 2003-2011 Chevrolet Express 3500, w/ Lock Cyl. Control Solenoid

Detailed Description

Standard Ignition US-331 is engineered for vehicles that rely on a column-mounted ignition switch to manage start and accessory functions. It is a direct-fit replacement for many Chevrolet, GMC, Cadillac, Buick, Hummer, Pontiac, and Oldsmobile models, including applications such as the Chevrolet Trailblazer, GMC Envoy, and Chevrolet Silverado 1500. The part number US-331 is also used across multiple interchange references, including Dorman OE Solutions 924-715, making it a practical match for service work where OE-style fit and electrical consistency matter.

Built with durable materials and copper alloy conductors, this ignition switch is designed to maintain stable electrical contact and low resistive loss during operation. Standard Ignition US-331 is a service replacement choice for GM ignition switch repairs on vehicles such as the GMC Sierra 1500, Chevrolet Tahoe, and GMC Yukon, where reliable switching performance is essential.

What It Helps Fix

• No-start or intermittent start conditions caused by a worn ignition switch
• Accessory or ignition circuit power loss
• Rough or inconsistent key-to-electrical switching response
• Electrical contact wear inside the column switch assembly
• Failure to maintain proper ignition circuit continuity

Installation Notes and Tips

Verify the connector style, terminal count, and column mounting location before installation. This part is listed for vehicles with a column-mounted switch and, on certain Chevrolet Express applications, with lock cylinder control solenoid equipment. Confirm the vehicle’s year, make, model, and ignition system configuration against the fitment data before replacing the original switch.

Quality Assurance

Standard Ignition states that this switch is built from high-grade materials and tested for both mechanical action and electrical performance before release. The US-331 is intended to deliver consistent fit and function for professional ignition switch service.