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PC: E21
UPC: 612314561551

Custom Wiring Harness (4-Way Flat Output) #56155

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  • Plugs into vehicle tail light assembly to provide a 4-way flat socket
  • Simple plug-and-play design eliminates the need for cutting or splicing
  • 4-way flat output connects tail lights, brake lights and turn signals
  • Equipped with a pulse width modulation (PWM) converter
  • Constructed with SMT circuitry for better performance and durability
  • Dust cover included to keep connector clean when not in use
  • Backed by a limited one-year warranty
  • Made in USA




  • Mount Type DescriptionBlank
  • Battery-PoweredYes
  • T-Connector LocationP3,P4
  • Shipping Weight1.563
  • Product Weight0.000
  • Side Application Type DescriptionBlank
  • FinishN/A
  • Part TypeCustom Wiring Harness
  • WarrantyOne-Year Limited Warranty
  • Turn and Brake Circuits3.0 Amps
  • Tail Light Circuits6.0 Amps
  • Electrical System TypePWM
  • Output Type4-Way Flat
  • Converter TypePulse Width Modulation (PWM) (Stop, Tail)

A CURT custom wiring harness (also called a T-connector) is a simple, plug-and-play electrical device that eliminates the need for cutting, splicing and soldering when installing vehicle-to-trailer wiring.

Most vehicles do not come ready to tow. Unless your vehicle has a towing package, it is probably not equipped with a trailer wiring connector. This is where CURT's custom wiring harnesses come into play. Custom wiring harnesses plug into your vehicle's electrical system using original equipment (OEM) connectors. Our custom wiring harnesses use two or more OEM connectors to plug in at the taillight assembly and provide a standard trailer socket to allow a trailer to be plugged into your vehicle's power system.

This harness provides a 4-way flat connector socket and comes with a circuit-protected converter. It is designed to be a custom wiring harness for certain years of the Chevrolet Sonic sedan or hatchback (to verify your vehicle compatibility, see the CURT application guide at CURT custom wiring harnesses are long-lasting and quick to install. They come with dust covers to keep your connector clean when not in use and feature a one-year limited warranty to give you peace of mind.

Guides & Install Sheets

Product Videos

2012 Chevrolet Sonic ALL
2013 Chevrolet Sonic ALL
2014 Chevrolet Sonic ALL
2015 Chevrolet Sonic ALL
2016 Chevrolet Sonic LS
2016 Chevrolet Sonic LT
2016 Chevrolet Sonic LTZ
2016 Chevrolet Sonic RS
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