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Horn terminals.

AlanNZ

AlanNZ

Cruisin' Guzzisti
GT Contributor
Joined
Sep 20, 2013
Messages
227
Location
Auckland
Does it matter which way round the connections on the horn go? I suspect not as the horn button just earths the circuit. I am fitting dual horns under the side fairings - one each side. Do I just connect these in parallel piggy-backing off the original cables. I was told by the dealer I didn't need to fit a relay but will check the current drawn by the 2 horns.
Alan NZ
 
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Some dealers are a danger to the marque.

Relay is needed. I fitted dual Fiamm horns and the draw is too much for the wires. If I remember correctly the draw is around 10 amps. The stock wires are something like 16 or 18 gauge. No Bueno.

Also, without a relay the resistance will be to high in the wires and you will not supply enough voltage. It will end up sounding like a muffled cow as these horns sounds vary with voltage. You would be ok with one horn but not two.

Run the wires in parallel (each horn getting its own wire split from the main). If you piggy back them in series the voltage drop from the first horn will affect the second.
 
Long story short, yes the Stelvio MUST have a relay and fused wire to the battery if you upgrade the horns.

On older Guzzis, there is a relay and reasonable wiring from the factory. They also often came with reasonable dual horns from the factory. So upgrading those horns did not require a relay and new wiring. A long time Guzzi dealer just might think they are still like that.

When I installed dual Fiamms on the Stelvio, I just made a simple harness to add the second horn and ran the two horns from the stock wiring because I am lazy. :D That WAS a mistake. So I added a relay and a fused wire from the battery.

I measured the current at the time. I forget what it was, but it was close to 10 amps for the pair of Fiamms. The inrush current to spin up a Stebel air horn is MUCH higher.
 
Thanks for the feedback. The consensus seems to be fit a relay. The twin horns I am fitting are hi/Lo frequency disc style like the OEM horn but slightly larger. I'm not sure what current they draw but will check this. I'll keep you posted on progress.
Alan NZ
 
With that style of horn make sure that nothing is touching the horns other wise they will not sound right. Also try to use the same mounting bracket that it came with. With some styles if you change the length of the bracket it affects the sound since the vibration is different.
 
canuck1969 said:
With that style of horn make sure that nothing is touching the horns other wise they will not sound right. Also try to use the same mounting bracket that it came with. With some styles if you change the length of the bracket it affects the sound since the vibration is different.
Click to expand...

+100% to that.

I had a set of Fiamms that broke one of the brackets. I made a stronger bracket, and it really killed the sound level. I have to make a thinner bracket that allowed the horn to vibrate to get the sound level back.
 
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