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Do two new horns (Fiamms, hi/lo) need TWO relays?

  • Thread starter Thread starter ironsheik
  • Start date Start date
I

ironsheik

Guest
Hey all,
I just got these horns setup on my bike and so far it sure seems like either will work fine but I might as well power both of them. I bought a relay with the horns assuming it would work for both but there's only one switched output post. Do I bridge the two horn positives or is that dangerous? Or do I need another relay? I've read all I could find in previous posts but everyone only mentions needing only one relay. Thanks for your help!

BTW: I was able to install both horns in the factory location by flipping the original horn bracket upside down and screwing the Fiamm holders to the top of the bracket which allows them to sit above the valve cover and still under the gas tank with plenty of clearance. It took a while to figure it all out but it works perfectly.

Josh
 
You can tie the high sides of the horns together, then to your relay. Depending on the model horns, these can draw up to 5A each for a total of 10A. Make sure your relay can handle this and use an in-line fuse holder to protect in the event of a short. The factory horns draw about 2.5A each.
 
Had Fammi's on the GS(X) when I got it. One side had a relay the other was straight from the switch.

After that it was a load of spaghetti and crimps.

Suzuki mad.
 
Personally, I'd just parallel the horns (just like the OEM ones were) and not even use a relay. Reasoning here is that the horn switch will take some extra current without problem......second is that if the new horns are a little lower resistance, most likely you'll see an increased voltage drop to them anyway (they won't draw as much current as you think).....IF the above seems to work without problems then eliminating a relay eliminates another device and circuit that can fail on your bike.
 
BlackStar said:
You can tie the high sides of the horns together, then to your relay. Depending on the model horns, these can draw up to 5A each for a total of 10A. Make sure your relay can handle this and use an in-line fuse holder to protect in the event of a short. The factory horns draw about 2.5A each.
Click to expand...

That's the way to do it (you play the guitar on the MTV:confused:). Use one relay for both horns and fuse.
 
I tried to run a set of Fiamm freeway blasters through the stock wiring. The voltage drop was so bad that the horns would just clunk once. The freeway blasters draw 5 A each vs. the 2.5A of the stock horns. With two horns the total draw is 10A, twice the original load. They work fine through a relay. The factory wiring, connectors, and switches do not seem to be able to support a 10A load without a significant voltage drop. Enough that the voltage at the horns drops below the minimum required to operate. BTW the connectors/contacts and wiring are like new albeit undersized.
I don't think I'd hang a 120W load on the charging system if it were constant. With the horns, I don't use them very often, If I need them, I need them loud! (i.e. something that will drown out a cell phone!)
I use the same relay as the coil power mod. I carry a spare in the bike in case of failure.
 
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