AND the answer is... there are two versions from the factory - one has the pigtail, and one does not. Mine does not, and apparently yours does not either. There are bare (?) wires (6 of them) with about 8" free up under the dash behind / above the "module" per the technicians at my dealer. So - I'll have to schedule it in next week to get them to wire those 6 into the connector, another connector, or direct to my 4 wire controller (mine is Tekonsha's Prodigy" wires.I am trying to install a Curt Spectrum brake controller on my 2021 Yukon Denali. I am unable to locate where the factory supplied pig tail plugs in.