Electrical Components Required For Flat Towing A 2016 GMC Canyon
Question:
Hi, Im planning to install the Demco Stay-IN-Play DUO Supplemental Braking System in my 2016 GMC Canyon. I understand that I need the Roadmaster Automatic Battery Disconnect but I have these questions: 1. Why does the battery need to be disconnected while towing? 2. I tow long distances non-stop full days cross-county = 600- 700 miles per day, do I need to install a battery charge line to ensure the battery has enough juice to operate the brakes effectively? 3. Do I need to leave the keys in the ignition to disable the steering lock? Perhaps this is the reason the battery must be disconnected? 4. I believe I need this kit to wire the signal and brake lights RM-15267, but do I need the Roadmaster Brake-Lite Relay Kit too: RM-88400 ? Thanks!
asked by: Alex B
Expert Reply:
GM requires you to disconnect the battery to prevent damage to any of the electrical components while flat towing your 2016 GMC Canyon. Failure to do so would place all liability for damaged components solely on you. I recommend installing the Roadmaster Automatic Battery Disconnect with Switch for Towed Vehicle w/ Supplemental Braking System # RM-766 to make disconnecting the battery as easy as flipping a switch.
Since you'll be travelling quite a distance I do recommend installing a charge line kit to keep your vehicle's battery charged and prevent you from arriving at your destination and then having to deal with a dead battery. You can use the BrakeBuddy Towed Vehicle Battery Charge Kit # BB54FR to pull up to 15 amps from your RV's battery to your vehicle's battery. The charge line kit will need to be connected to the center pin of the 6-way on your vehicle.
You are going to need to keep the key in the ignition in the ACC/ACCESSORY position to prevent the steering column from locking while towing.
The Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit # RM-15267 is a great choice to use your GMC Canyon's tail lights and wiring system while preventing feedback from your RV. Since you'll be using a supplemental brake system ( # SM99251) you will possibly need the Roadmaster Brake-Lite Relay Kit for Towed Vehicles # RM-88400. You'll need to go through the following steps to know for sure:
Are you using a supplemental braking system that depresses the brake pedal in your towed car?
No - You do not need a brake light relay.
Yes - You may need a brake light relay. Continue on to the next question.
Do the brake lights on your towed car illuminate while the engine is off?
No - You do not need a brake light relay.
Yes - You may need a brake light relay. Continue on to the next question.
Do your towed car's brake lights act as both the brake signals and the turn signals?
No - You may need a brake light relay. Continue on to the next question.
Yes - Your towed car has a combined lighting system. You will need a brake light relay to ensure proper activation of its signal lights.
Does your towed car have separate brake lights and turn signals?
No - Your towed car has a combined lighting system. You will need a brake light relay.
Yes - Your towed car has a separate lighting system. You may need a brake light relay. Continue on to the next question.
Are you wiring your vehicle with a six-diode kit or a TowDaddy custom wiring harness?
No - You will need a brake light relay to ensure proper activation of your towed car's signal lights.
Yes - You do not need a brake light relay.
Products Referenced in This Question
BrakeBuddy Towed Vehicle Battery Charge Line Kit
- Accessories and Parts
- Tow Bar Braking Systems
- Wiring
- Battery Charge Line Kit
- Brake Buddy
more information >
Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit
- Tow Bar Wiring
- Splices into Vehicle Wiring
- Diode Kit
- Universal
- Tail Light Mount
- Roadmaster
more information >
Roadmaster Battery Disconnect with Switch for Towed Vehicle w/ Flat Tow Brake System - Gas
- Accessories and Parts
- Tow Bar Wiring
- Auto Battery Disconnect
- Roadmaster
more information >
Roadmaster Brake-Lite Relay Kit for Towed Vehicles
- Tow Bar Braking Systems
- Brake Light Relay
- Roadmaster
more information >
Product Page this Question was Asked From
Demco Stay-IN-Play Duo Flat Tow Brake System for RVs w/ Hydraulic Brakes - Proportional
- Tow Bar Braking Systems
- Brake Systems
- Proportional System
- One Time Set-Up
- Fixed System
- Power Assist Brake Compatible
- Hydraulic Brakes
- Demco
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Shop: Vehicle Tow Bar Brake System
- Shop: Base Plate for Tow Bar
- Shop: Roadmaster Direct-Connect Base Plate Kit - Removable Arms
- Shop: Demco Stay-IN-Play Duo Flat Tow Brake System for RVs w/ Hydraulic Brakes - Proportional
- Video: SMI Stay-IN-Play DUO Braking System Installation - 2016 GMC Canyon
- Video: Demco SBS Stay-IN-Play DUO Braking System Installation - 2019 GMC Canyon
- Shop: Vehicle Tow Bar Wiring
- Shop: Brake Buddy Stealth Supplemental Braking System - Proportional
- Shop: Roadmaster Tail Light Wiring Kit for Towed Vehicles - LED Bulb and Socket - Red
- Shop: Blue Ox Adventurer Adjustable Tow Bar - Coupler Style for 2" Ball - 5,000 lbs
- Shop: etrailer Invisible Base Plate Kit - Removable Arms
- Shop: Trailer Wiring
- Search Results: rm~156~25
- Search Results: 99251
- Video: SMI Stay-IN-Play DUO Braking System Test Course
- Q&A: SMI Stay-IN-Play DUO Supplemental Braking System Not Moving Brake Pedal on 2018 GMC Canyon
- Q&A: Will the SMI Stay-IN-Play DUO Work on a 2017 Ford Expedition with Adjustable Pedals
- Shop: Roadmaster Battery Charge Line Kit for Motorhomes
- Shop: RV Antenna and Radio
- Shop: Vehicle Seat Covers
- Shop: Trailer Hitch
- Q&A: Does SMI DUO Tow Bar Braking Kit Fit Gas Versions of 2018 GMC Canyon Same as Diesel
- Q&A: 20 Amp Fuse Keeps Blowing on the SMI Stay-IN-Play DUO
- Search Results: safety cables
- Search Results: towed vehicle lights
- Video: Roadmaster Tail Light Wiring Kit Installation - 2021 Chevrolet Spark
- Video: Blue Ox Tow Bars - Coupler Style - BX7322 Review
- Video: Roadmaster Reflex Steering Stabilizer Review RM-RBK1-RSSC
- Video: Review of Roadmaster Anti-Sway Bars - Exact Center Steering Stabilizer With Bracket Class A - RM65RR
- Search Results: rock guards