Installing Tekonsha ZCI Wiring Harness on 2019 Audi A5

Published 08/29/2019

Question:

Ive got the tekonsha modulate zci trailer wiring kit for my 2019 Audi A5. Im having difficulty finding the right wires to connect to. Can you provide some 2019 A4/A5 specific info?

asked by: Steve

Expert Reply:

The best way to locate the correct wires behind the tail lights of your 2019 Audi A5 to use for the Tekonsha ZCI Wiring Harness # 119250KIT is to simply test them for function using the included circuit tester. With that being said I was able to track down some wire functions on your Audi A5 that should hopefully at least guide this process.

It looks like the wire that carries the left turn signal behind the tail light is gray in color. The wire for the left side running lights is green and black. The wire for the left side brake lights is blue and gray.

Behind the right tail light the gray and black wire should be for turn signal and the blue and gray wire should be for brake lights. The black and green wire should be for the running light circuit.

Please only use this as a guide in your installation (you can start by testing these wires). I don't recommend relying on colors alone because it's still possible your specific model uses a different scheme.

expert reply by: Chris R