October 19, 2023 at 4:39 am
#784306
Participant
Sorry about all the posts but I keep thinking of things to include.
You can also call your dealership parts department (my dealer service department send me to parts for the instructions). Mine very nicely emailed the instructions.
Both part number 86544321 and 84938261 are shown and can be ordered on “accessories.gmc.com”. They are listed under the “electronics” section.
Instructions for hooking up the “Aux” switch already in the truck are included with the instructions for the junction box (86544321).