Standard Ignition HLS1787 Headlight Switch

Headlight Switch for GMC Sierra HD and Sierra 1500

Standard Ignition HLS1787 is a plug-in headlight switch built for direct replacement in select GMC Sierra trucks. It uses a 12-terminal layout with a female connector, male terminals, and a snap-fit attachment method for a factory-style electrical connection.

Fits 2020-2024 GMC Sierra 2500 HD, w/o Security Lighting. Fits 2020-2024 GMC Sierra 3500 HD, w/o Security Lighting. Fits 2020-2022 GMC Sierra 1500, w/o Security Lighting.

Key Features

• Part number HLS1787 for direct identification
• 12-terminal headlight switch design
• Plug-in connector with 1 female connector
• Male pin terminals for electrical interface
• Snap-fit attachment method for secure mounting
• Black and chrome finish with plastic construction
• Switch function for headlight control

Detailed Description

Standard Ignition HLS1787 is a replacement headlight switch for GMC Sierra applications that require a plug-in, snap-fit design and a 12-terminal electrical layout. It is built with a plastic body and black/chrome finish to match the original interior switch appearance while restoring headlight control function. This part cross-references Standard Ignition HLS1787 for the same application.

For buyers searching for a 2020-2024 GMC Sierra 2500 HD headlight switch, a 2020-2024 GMC Sierra 3500 HD headlight switch, or a 2020-2022 GMC Sierra 1500 headlight switch, HLS1787 provides a direct-fit replacement path for trucks without Security Lighting. The connector type, terminal gender, and attachment style are listed to help confirm electrical and physical match before installation.

What It Helps Solve

• Headlight switch failure or intermittent operation
• Loss of normal lighting control from the dash switch
• Worn or damaged switch contacts
• Broken connector fitment at the switch interface
• Interior switch replacement after electrical wear

Installation Notes and Tips

Verify the vehicle is equipped without Security Lighting before ordering. Confirm the 12-terminal connector layout, female connector, male pin terminals, and snap-fit mounting style match the original switch. Compare the part number HLS1787 and the vehicle application against the existing component before removal.

Quality Assurance

Standard Ignition supplies replacement electrical components for service and repair applications. HLS1787 is specified with the listed connector and terminal details to support accurate fitment on the covered GMC Sierra models.