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Fiamm horn/relay question.
- wa1nca
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Re: Fiamm horn/relay question.
To add a relay to support 2 or more horns
Remove 15 anf HO wires from the horn
Connect the coil on a relay to 15 and HO
Add a jumper from 15 to center contact of relay,then a wire from contact of relay to feed power to the 2 horns in parallel and ground as shown
Now when the horn button is depressed the relay closes contacts and send power to both horns
Not sure were you relay is located but should give a better idea how to connect the relay wires as you said it did work earlier
54 R51/3, 55 R50/Velorex 560 sidecar, 64 R27, 68 R69US, 75 R75/6
Ashfield, Ma
USA
- srankin
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Re: Fiamm horn/relay question.
So, in your configuration, where is the higher current draw power coming from?
I can see where you are getting the low current trigger power from.
How does your diagram compare to the relay he has on hand? St.
- wa1nca
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Re: Fiamm horn/relay question.
I don't know what he has for a relay or where it was located (headlight shell or near horn)
54 R51/3, 55 R50/Velorex 560 sidecar, 64 R27, 68 R69US, 75 R75/6
Ashfield, Ma
USA
- wa1nca
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Re: Fiamm horn/relay question.
What a mess
Does a additional horn button gets added so the relay get power to energize the relay to power the dual horns with a larger red feed wire and still have the original horn setup
54 R51/3, 55 R50/Velorex 560 sidecar, 64 R27, 68 R69US, 75 R75/6
Ashfield, Ma
USA
- RideSolo
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Re: Fiamm horn/relay question.
The old girl is 50 years old and has been sitting for the last 35 years. The guy I bought it from was absolutely no mechanic by his own admission so everything done to it was done by the original owner. He was an older German gentleman in the Cincinnati area who meticulously took it to the dealer every 5,000 miles like clockwork but as I've gone through everything it's seemed like that was the limit of his meticulousness; I've found very little attention to detail and care. That's ok, it's now got a good home w/ me and I'm trying to move it into being a lovingly maintained and quiet "old man's bike" with new OEM replacement parts as necessary and period touches like the Wixom panniers, R90S fairing, Brown side stand, and Lester wheels. But at the same time I want to actually USE it so I've done a R90X front brake conversion, bar-end mirrors, and switched to stainless fasteners. I expect it'll serve me well and make me happy for many years.
Cory E.
Bucyrus, Ohio
Retired USAF
- srankin
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Re: Fiamm horn/relay question.
Yeah the single horn will draw 3 or 4 amps, less than the fuse cut out. Maybe some other larger horn may draw the same or less, a single horn of the dual horn system (high tone horn paired with a low toned) will draw under 8 amps.
Wa1nca may have hit the nail on the head as to where the mystery high current power lead to supply the horns came from. Off the starter relay. Check on the starter relay under the gas tank and look to see if perhaps the red wire at pin 30 has been tapped into. This would mean a short wire from that relay to the mystery relay. And the mystery relay could have been mounted near the starter relay under the gas tank. So no long wire running to the battery.
Then the trigger current would be the green/white or in his diagram green wire and brown wire at the horn.
So, LOL, after all the confusion, if you still want to hook up dual horns, that would be the way to do it.
- srankin
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Re: Fiamm horn/relay question.
- RideSolo
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Re: Fiamm horn/relay question.
The single horn works however it wasn't w/o problems and pitfalls. I couldn't get my little brain to wrap itself around how in the world they had made the whole Fiamm horn w/ relay lashup work in the past. It shouldn't have! Many chimed in here and attempted to assist and I really appreciate their inputs... some I followed and understood and others I had to just say, "Huh?" (Note the "little brain" comment above, I try to work w/ what I was given!). Anyway, I thought I had it all figured out and went to work connecting and testing: Yep, all good! So I then did up the wiring I need and tested again: Yup, all good! The next step was to heat shrink and wire wrap everything and test again: Yup, all good! Then I mounted the horn, tested: Turn on the key and "BEEEEP!" Obviously a dead short but not the fuse-blowing kind. I unhooked the battery, turned off the lights, locked the shop, and went in the house. After a couple minutes thinking I realized what was going on; a + wire and a - wire and a grounded horn creates a dead short when the key switch is turned on. The next morning I went out and took the horn off the bike and, sure enough, all worked as it should. I used some plastic washers to insulate the horn from the frame and we're now good, beeping good.
Back to the relay: it's housed in a plastic case and was mounted to the frame with a bolt through a plastic tab w/ a hole in it so when mounted, the relay wasn't grounded. There was no direct power wire connected to the relay to power it's coil. I think they somehow used the + wire from the horn button to power the relay as well as the horn. Someday if I'm really bored I may dig the thing out and mess with it again but for now I've achieved what I needed; an operative hooter, alles gut und fertig.
Cory E.
Bucyrus, Ohio
Retired USAF
- srankin
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Re: Fiamm horn/relay question.
I really don't think you need a relay for just a single horn even a fiamm current draw from a single horn should not be more than 8 amps. Less than the fuse blow point. Are there specifications for the horn's power supply?
I don't want to mess with your head much more than I have but, there is no + horn button wire. The horn button is a ground switch.
The + for this circuit is the Green/black wire. So power flows from the green/black wire through the horn, and is grounded to complete the circuit when the horn button is pushed.
There maybe current at the horn button, but is sourced from the horn, take out the horn and use only the two wires for the horn button Brown/white and brown, you will get no power.
There, LOL, I just can't be a know it all, sorry. St.
- RideSolo
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Re: Fiamm horn/relay question.
No know it all here either, for sure, just an old retired USAF NCO office administrator who's happily trying to keep learning and growing... hopefully not just growing around the waist!srankin wrote: ↑Mon Apr 08, 2024 11:27 amSo am I reading correctly, you installed one horn or two?
I don't want to mess with your head much more than I have but, there is no + horn button wire. The horn button is a ground switch.
The + for this circuit is the Green/black wire. So power flows from the green/black wire through the horn, and is grounded to complete the circuit when the horn button is pushed.
There maybe current at the horn button, but is sourced from the horn, take out the horn and use only the two wires for the horn button Brown/white and brown, you will get no power.
There, LOL, I just can't be a know it all, sorry. St.
One horn. I applied power to each of the two and picked the clearest, loudest, and most noticeable of the two.
My phraisology. I was referring to the green/black as the + wire. When I attached my volt/ohm meter, + to the green/black and - to the brown/white, the meter would show a bit above 12vdc when I pressed the horn button. That's where I was getting my context for the + and - wires. In my old world of Japanese motorcycles there's usually one "horn wire" and the circuit is completed by energizing that wire via the switch and said energy flows through the horn and completed the circuit by grounding on the frame. I'm learning... I hope.
Cory E.
Bucyrus, Ohio
Retired USAF