404 Parts

9L7 Upfitter Auxiliary Switches Ignition & Dimming Retrofit Harness

  • Sale
  • Regular price $165.00
Shipping calculated at checkout.

This harness was developed to supply the necessary wiring to add missing circuits to a GM Upfitter Auxiliary Switch kit for applicable GM vehicles. This harness is intended to run inline from the factory USB connection (specificied in instructions) to the gray connector located under the dash. Completely plug & play without cutting or splicing and is wrapped to match your existing factory wire harnessing for a seamless OEM look.  


  • High Quality OEM Grade Connectors
  • Matching Gauge Wire
  • Professionally wrapped for a seamless OEM look 


  • 2022-2024 Silverado 1500 2500 3500
  • 2022-2024 Silverado 1500 2500 3500
  • Harness can be applicable to both Old and New interiors. Some "Old" interior trucks will be missing the same circuits as the "New".  
  • VIN Check Guarantee does not apply to custom wiring harnesses. 

VIN Check Guarantee:

Submit Your VIN at Checkout to Qualify

Warranty & Returns:

Click to review our Return & Warranty policies


Click to review our Shipping policies

California Residents:

California Prop 65 WARNING: Cancer and Reproductive Harm. For more information go to https://www.P65Warnings.ca.gov