Standard Ignition S2635 Tail Light Wiring Harness - Left

Tail Light Wiring Harness for GMC Sierra

Standard Ignition S2635 is a left-side tail light wiring harness built for direct replacement on select GMC Sierra trucks. It uses a 5-position square connector, 18-gauge wire, and blade-style terminals to restore a secure electrical connection at the rear lamp assembly.

Key Features

• Tail light wiring harness for the left side
• 5 connector positions with a square connector shape
• 18 ga. wire for rear lighting circuit repair
• 39.5 in. harness length for routing to the lamp assembly
• Male connector with female blade terminals
• Housing length: 1 1/2 in.
• Standard Ignition S2635 replacement part

Detailed Description

This Standard Ignition S2635 tail light wiring harness is made for rear lighting service on 2016-2018 GMC Sierra 1500, 2016-2019 GMC Sierra 2500 HD, 2016-2019 GMC Sierra 3500 HD, and 2019 GMC Sierra 1500 Limited, all in the left position. It is a practical replacement when the original harness has damaged terminals, broken conductors, or connector wear that interrupts tail lamp operation. This part cross-references OE-style replacement numbers such as 23295980 and LS2536 for the same application.

What It Helps Repair

• Intermittent or inoperative left tail light function
• Corroded or heat-damaged rear lamp wiring
• Broken connector tabs or loose terminal contact
• Electrical faults caused by worn harness insulation
• Rear lighting issues on GMC Sierra 1500, Sierra 2500 HD, and Sierra 3500 HD trucks

Installation Notes and Tips

Verify connector shape, terminal style, and harness routing before installation. Match the left-side application to the vehicle and inspect the lamp socket, ground path, and adjoining wiring for damage before connecting the new harness. Confirm secure terminal engagement and proper rear lamp operation after installation.

Quality Assurance

Standard Ignition replacement electrical components are built for service-focused repair work and consistent fitment on listed applications. Use this part when you need a direct replacement tail light wiring harness for GMC Sierra rear lighting repair.