How To Connect Trailer Brake Controller To Cold Side Of Stoplight Switch In 2020 GMC Terrain
Question:
Brake controller install on a 2020 GMC Terrain. I've heard you can't just go into the stop light wire like usual. Is this true? So what's the alternative?
asked by: Dan
Expert Reply:
You are correct. On your 2020 GMC Terrain connecting a trailer brake controller harness is a bit different as you cannot just connect the red stoplight wire directly to the cold side wire of the stop light switch.
The work around for this is you will need to pick up the cold side wire in the BCM (Body Control Module) of your Terrain. The BCM is located between the emergency brake pedal and brake pedal about where your left knee is when sitting in the driver seat as shown in the included diagram.
You will need to use a quick splice like # SWC502905-1 to connect the red stoplight wire from your trailer brake controller harness to the white wire at the number 11 position of the BCM plug which is shown in the included diagram. This will connect your controller to the cold side of the stop light switch which only has power when the brake pedal is pressed.
I included a link to a helpful article on installing a trailer brake controller for you to take a look at as well.
Products Referenced in This Question
Quick Splices - Self-Stripping Connector - Closed Port - 14-16-18 Gauge - Blue - Qty 1
- Wiring
- Wire Connectors
- Quick Splice Connectors
- 18-16-14 Gauge
- Spectro
more information >
Product Page this Question was Asked From
Continue Researching
- Shop: Brake Controller
- Shop: Redarc Tow-Pro Elite Brake Controller - Dash Knob - 2 Braking Modes - 1 to 3 Axles - Proportional
- Video: Curt Vehicle Wiring Harness Installation - 2018 GMC Terrain
- Video: Choosing the Right Brake Controller
- Q&A: How To Tell If a 2020 GMC Terrain Has the Factory Tow Package for Trailer Wiring
- Q&A: Troubleshooting No Power At The Factory Trailer Plug
- Search Results: stud mount led clearance lights
- Search Results: 9506p
- Shop: Mighty Cord RV Power Cord - 30 Amp - 25'
- Shop: RV Electrical
- Shop: RV Power Cord
- Shop: Equal-i-zer Weight Distribution System w/ 4-Point Sway Control - 6,000 lbs GTW, 600 lbs TW
- Shop: Curt Trailer Connector Adapter with Backup Alarm - 4-Way to 7-Way RV and 4-Way Flat
- Shop: Vehicle Tow Bar Brake System
- Shop: Trailer Wiring
- Shop: Trailer Hitch
- Article: Towing a Trailer? Let's Talk About Brake Controllers
- Article: Troubleshooting Brake Controller Installations
- Q&A: Where to Connect the Stoplight Wire on Brake Controller Pigtail
- Shop: Mighty Cord Replacement RV Power Inlet - Twist Lock - 30 Amp - Black
- Shop: Roadmaster InvisiBrake Flat Tow Brake System - Preset
- Article: Determining Trailer Tongue Weight
- Video: Mighty Cord RV Power Cord Review
- Video: Performance Tool Hook Probe Circuit Tester Review
- Q&A: How Does Monitor of Roadmaster InivisiBrake Wire Up
- Q&A: Recommended Placement of InvisiBrake Module on a 2019 Jeep Cherokee Latitude Plus
- Search Results: rv power cord
- Search Results: roadmaster stop light switch
- Search Results: roadmaster
- Shop: Equal-i-zer Weight Distribution System w/ 4-Point Sway Control - 12,000 lbs GTW, 1,200 lbs TW