To be clear, the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118561 is not a confirmed fit for the 2014 Audi A5. This wiring harness fits 2012-2016 Honda CR-V. If you are looking for a wiring harness for a 2014 Audi A5 I recommend the ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector and Installation Kit # 119250KIT.
In order to troubleshoot this problem I would first begin by checking the ground since it should be quick and simple.... view full answer...
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