If you've already got a 4 flat like the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56044 on your 2013 Cadillac CTS then in order to add a 7 way connector you'll want to use the # ETBC7L. The # ETBC7L is designed to work with wireless brake controllers, so I recommend using the Curt Echo # C51180 which is controlled by smartphones running iOS 8.0 or newer, or Android 4.4 or newer. The Echo plugs into the # ETBC7L and accepts the trailer's 7 way plug to... view full answer...
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