Buying a Train Horn Tomorrow!! Need Help!

[my335is]

@DBO

I don’t think they provide a momentary switch or button to honk the horn since it’s generally not required. Best bet is to just wire it to your default horn button (i.e. steering wheel). There should be a toggle switch (a two position switch; also referred to as an SPDT switch) included in the kit which you can then use to select your stock vehicle horn or the S4 madness.

Here’s a basic diagram of how the toggle switch is wired into to your stock horn:

That would be awesome to switch between airhorn and stock! I’ll make sure to let the installer on Monday know! Thanks! Hopefully BMW didn’t complicate this somehow haha. Should be nice the battery is in the back I hope that makes the install easier.

[my335is]

Alright install day is tomorrow!! If you guys had any advice from your own install experience what would it be?!