How to Bypass a Factory Brake Controller in a 2015 GMC Sierra 3500 to Install Prodigy P2
Updated 06/01/2026 | Published 07/29/2015
Products Featured in This Question
Question:
I have a 2015 GMC Sierra 3500HD with Duramax. It has the factory towing package including wiring harness for camper / fifth wheel / gooseneck. My truck also DOES have the factory intergrated brake controller. But, I want to use the Prodigy 2 brake controller with wiring adapter harness that plugs right into my truck under left side dash panel. Is anything else required to be connected? Or is anything with the factory braked controller required to be disconnected or disabled ?
asked by: Steve A
Expert Reply:
In order to bypass your factory installed controller and install an aftermarket brake controller like the Prodigy P3 Trailer Brake Controller, # 90885, with Plug-In Wiring Adapter, # 3016, you will have to make a couple of cuts and connections.
First you will cut the blue wire on the plug-in wiring adapter and connect it to enough 12-gauge blue wire to reach the rear of the truck. Now at the 7-way trailer connector at the back of the truck, you will cut it's blue wire approximately 4 to 6 inches from the connector and connect it to the blue wire that was run from the brake control wiring harness. I recommend using Deka Heat Shrink Butt Connectors, # DW05745-10, and electrical tape when making all electrical connections. Now you are ready to plug the wiring adapter into the brake control port up under the dash and into the back of your new controller.
Mark
5/29/2026
Jameson , can you add a little more clarity where you cut the wire. Is it up in dash etc? I understand ill be running a wire down to the 7 way . My main issue is that gm metripack socket that plugs into the gm 7way recepticle is bad. A few of the connections pull out. So along with wanting to get rid of the integrated crap. Do you guys have a new socket in some kind of harness or a 7way receptacle I can wire directly.
Jameson C.
6/1/2026
Continue Researching
- Shop: RV Interior Lighting
- Shop: Alpha Systems 1021 Self-Leveling Sealant for RVs - White - 10.3 oz - Qty 1
- Shop: Gustafson 12V RV LED Puck Light - Surface Mount - 4-3/8" Diameter - Warm White
- Shop: Specialty Recreation RV Skylight w/ Sealant - 24" x 12" - Neo Angle - Smoke
- Shop: Phoenix Faucets RV Handheld Shower Set - Single Function - Brushed Nickel
- Search Results: tekonsha brake controller harness
- Search Results: proportional controller trailer brake controller
- Search Results: tekonsha custom fit vehicle wiring
- Shop: Specialty Recreation RV Skylight w/ Sealant - 14" Wide x 22" Long - White
- Shop: 12V RV LED Puck Light - Surface Mount - 3" Diameter - Cool White
- Shop: Brake Controller
- Q&A: Can Tekonsha Primus IQ Trailer Brake Controller Be Used with Electric-Over-Hydraulic Brakes
- Shop: Bauer Products Camper Door Lock - Black
- Search Results: shower head
- Search Results: rv skylight
- Search Results: self leveling sealant
- Search Results: decor self leveling
- Q&A: Where Are Trailer Light Fuses Located At on 2021 Ram 2500
- Q&A: Compatibility Of Tekonsha Prodigy P3 Brake Controller and HydraStar Electric Over Hydraulic Actuator
- Video: Review of Pace Edwards Replacement Reel Spring Assembly Tonneau Cover - PE86RB
- Q&A: Replacement Spring/Reel Assembly for the Pace Edwards JackRabbit Tonneau Cover
- Q&A: Recommended Replacement For An Atwood GC6AA-10E Water Heater
- Article: Aftermarket Brake Control Wiring for 07-13 GM Full-Size Truck with Factory-Integrated Brake Control
- Q&A: Bypassing Factory Brake Controller and Installing Aftermarket Model on 2018 GMC Sierra 3500
- Article: Trailer Wiring Diagrams
- Video: How to Choose a Trailer Brake Controller
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Shop: Trailer Hitch
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Shop: Trailer Wiring
on Trailer Brake Controller
Frank I.
12/10/2024
Hi Jameson, when you say cut the blue wire on the plug in wiring adapter which end do you attach the long blue wire to that goes to the 7 way connector is it the plug end of the wire going under the dash or the cut wire coming from the controller end of the adapter. Thank you Frank