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Premium Member
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Discussion Starter #1
Have two Wolo Bad Boy horns on order. Want to increase my hearing loss, scare small children, simultaneously violate noise ordinances in surrounding communities, wake the dead, and hopefully get the attention of inattentive cagers by installing them on the Vulcan. Can I run them both off the same 30 amp relay, or will I need two? Electrical knowledge extremely limited, :BLAM: your input welcome.
 

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Premium Member
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812 Posts
Hey Flite, you should have no trouble running both horns off one relay. I got to tell you man, I put a Stebel on my bike and it's loud (139db) so you'd think that the cagers would notice. Tough to pay attention when you got the music cranked up and you're on the phone. I had one SOB come accross 3 lanes of traffic, fortunately we were both going no more than 30, saw him coming so I started blowing, nothing! I slammed on the brakes and started to skid. I was sure that I was going to meet that idiot but missed his rear bumper by a couple of inches. He turned off the road and I decided not to put my boot through his door.

Lots of luck :motorcycl
 

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Linkmeister Supreme
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7,960 Posts
The OEM horns are marked 2.5 amps, the pair of Fiamm Freeway Blasters I have ready to mount are 5 amps, and Jim at the local bike night last Friday said his Stebel (same as your Wolo`s) is 15 amps, but I have not been able to confirm any specs online for current draw on it at all. I will be surprized if the compact air horn does draw 15 amps, so I agree with gemguy that one 30 amp relay should run a pair of them with no problem.

My Fiamms are rated at 132 db each, and are going in the stock mounting position in place of Ma Kawi`s beep, beep, road runner horns. They look good there, not too big like I think a Stebel or Wolo would be. I can hardly wait to test them on the bike, not just tested with a booster cable and juggling the horns in my hands! BTW- I picked them up locally at Princess Auto for ~$15 each. Same ones at NAPA were $34.
 

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Columbus, Ohio
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523 Posts
My Fiamms are rated at 132 db each, and are going in the stock mounting position in place of Ma Kawi`s beep, beep, road runner horns. They look good there, not too big like I think a Stebel or Wolo would be. I can hardly wait to test them on the bike, not just tested with a booster cable and juggling the horns in my hands! BTW- I picked them up locally at Princess Auto for ~$15 each. Same ones at NAPA were $34.
Pictures?
 

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Premium Member
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Discussion Starter #5
Thanks for the information.

Every "real world" horn decibel test I could find revealed that the manufacturer's decibel rating far exceeded what was actually recorded. Here's just one: http://www.webbikeworld.com/motorcycle-horns/motorcycle-horn-comparison.htm

So I figured mounting two "high performance" horns would ensure I was heard. Read one review where a guy said the horns I bought drew 10-15 amps. Where he got that figure I have no idea, since the manufacturer doesn't provide it.

I bought Fiamms shortly after getting the Vulcan and planned to mount them in place of the stock horns. But thought they needed some bling and plastic "chrome" horn covers for the 3.5" Fiamms ran around $13 each, making them more expensive than the horns! So the Fiamms are going on the truck.

The chrome Bad Boy horns will be mounted to the frame on either side.
 

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Linkmeister Supreme
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7,960 Posts
Pictures?
I do have a digital camera now, and will try to post some pics this week. The bike is parked in the shade, and I can`t move it by myself yet. I hate pictures taken like that because the detail doesn`t show, but I will do my best.
 

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Premium Member
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Discussion Starter #7
Hopefully, the final question. The horns came in today and each has a 40 amp relay. They recommend a 20 amp inline fuse with a single horn installation. How large a fuse should I install for two horns?
 

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gun slinger
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1,110 Posts
Hey Flite, you should have no trouble running both horns off one relay. I got to tell you man, I put a Stebel on my bike and it's loud (139db) so you'd think that the cagers would notice. Tough to pay attention when you got the music cranked up and you're on the phone. I had one SOB come accross 3 lanes of traffic, fortunately we were both going no more than 30, saw him coming so I started blowing, nothing! I slammed on the brakes and started to skid. I was sure that I was going to meet that idiot but missed his rear bumper by a couple of inches. He turned off the road and I decided not to put my boot through his door.

Lots of luck :motorcycl
some how i just pictured arnold swartsagovernor < lol as the terminator where hes toateing a 12 Ga shotgun on his bike lol :rockon:
 

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Kawika
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441 Posts
use 12-14 gauge power wire and you can try fusing it at 30 amps...35 should definitely be fine, if they draw 15 amps each. test the horns for 5-10 seconds to make sure it doesn't pop the fuse...don't forget to put your earplugs in first!
 

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Premium Member
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Discussion Starter #10
Again, thanks guys. This forum is very helpful! Already have the 12 ga wire. Need to find a 12 ga fuse holder too, and I should be good to go!

Gonna put my muffs on over the plugs when I test 'em!
 

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Premium Member
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812 Posts
The 30 amp relay should be fine unless you blow those bad boys for 5 minutes at a time.

Pictures, I believe I have some pictures of my Stebel installation in my album.
 

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Banned
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1,620 Posts
I would guess that if you put a meter on the coil of the compressor and find the resistance of it, you should be able to apply Ohms law to find the current, and therefore the fuse/wire size to use.
For example, if the coil was 1 ohm and you figure 12 volts into it, that would be 12/1 = 12 amps. Two compressor, wired in parallel, would be double that at 24 amps. Figure 125% of that and you get a 30 amp fuse. I would probably run 12 gage wire on that. One relay should be fine. I believe the coils will draw far more than that when first energized for a split second, if I recall my electrical theory correctly
 
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