The Curt Trailer Hitch Receiver C11823 does not come with wiring for your 2005 Mercedes-Benz S-Class so you will need to buy it separately.
I recommend the ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector and Installation Kit # 119250KIT. This is a universal wiring kit that uses zero-contact interface sensors so no cutting or splicing is required. It has instructions, but they are not vehicle specific.
We do not have an installation video for a 2005 Mercedes... view full answer...
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