The 2007 Volkswagen Eos has a Multiplexed wiring system that requires wiring the Upgraded Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness, item # C59496, for a trailer connector. There are 3 ways of wiring depending on how your vehicle is wired from the factory. In the instructions, at step 9 (see link), it explains that you may have a two wire system that requires the red stop wire to be grounded along with the white wire. If you have the 3 wire system (most likely) with amber... view full answer...