I searched and couldn't find anything. After installing my new alpine Navi and HU, I have lost my turn signal noise. I used the optional controller that keeps the steering controls and the volume side works, what gives? Are there any thoughts from the collective brain?

 

it's very simple. interface module that's been used in your Alpine installation, has an output for turn signal sound. all You have to do is add relay to it. (it's actually shows in instruction manual