German wiring diagrams show the set up. I made a blog post about it a while back

http://shufti.wordpress.com/2010/10/06/dual-horn-relay-and-wiring/

alistair

On 2012-01-23, at 11:57 AM, Chris S. wrote:

> Correct. Spec calls for minimum 15 amp fuse. The stock horn wiring is too wimpy for such draw. 118 decibels sucks a lot of current. 
> 
> http://youtu.be/-gDRBVMQ9as
> 
> 
> Chris.
> 
> Wysłane z iPhone'a
> 
> Dnia Jan 23, 2012 o godz. 13:18 george jannini <georgejoann@GMAIL.COM> napisał(a):
> 
>> A second horn requires a relay- or so I've heard.
>> 
>> Geo/ATL