Your picture seems to show a connection / fuse / relay box in the Tahoe, which I think you refer to as the "control box". The pigtail connector is the white connector partially hidden by the piece of paper - it has four wires going into it, right? The Tahoe's pigtail connector is supposed to plug into a matching connector on the Prodigy. If the connectors don't physically match, then the Prodigy should have come with an adapter.
DON'T plug that connector into the big ivory-colored connection block in the photo.
Bill
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