Parts Needed to Install P2 Brake Controller in 2018 GMC Acadia with Factory 7-Way

Question:

Your front page indicated I need an ETBC7 wiring harness My 2018 GMC has the tow package with the 7pin plug installed. Is the ETBC7 the item I will need to install the controller part # 90885

asked by: Michael K

Expert Reply:

Your 2018 GMC Acadia actually has blunt cut wires for you to splice in a brake controller like the Tekonsha Prodigy P3 # 90885. The last Acadia to use the Adapter # 3026-P that you referenced was the 2017 Limited which was the same as the 2016 model year. The 2017 New Body and newer have the blunt cut wires up under the dash.

I took a look at the online version of the owner's manual for your 2018 Acadia and on page 278 it says that the blunt cut wires can be found above the parking brake assembly and you will need to connect the following wires from the Acadia to the following functions on your brake controller:

Blue - Trailer Brakes
Red/Black or Red/Blue - 12V Power
White/Blue - Stoplight Signal (only gets hot when pedal is pressed)
Black - Ground

This is all you'd need to install the P2 part # 90885.