series or parallel

atjurhs

.060 Over
Joined
Aug 11, 2017
Messages
105
Location
Huntsville Alabama
Ride
2017 R3 Roadster
hey guys,

i plan to "boost" the horn capability of my R3, so i bought a FIAMM Low Note O.E. Replacement horn.

i like to add it to the current horn, so my question is should i wire it in series or in parallel with the stock horn?

thanks for your help!

Todd
 
Neither. Disconnect the current horn and use the wiring to trigger the solenoid which will then supply power to the new horn.
 
idk, i want the "beep" of both horns.

Billy, i'm not familar with the wiring diagram of the R3 either, so chasing wiring isn't for me. i'm planning on just connecting to the two wires that already connect to the current horn.

if i include an in-line fuse what wattage would you use?
 
You are essentially doubling the load (at least) by adding another load (Extra horn) and really should be done with a RELAY to ensure enough current is delivered to the two horns giving maximum performance to both.
 
Mittzy, what i think i hear you saying is that my plan of just adding it into the current circuit either in parallel or in series won't work, correct? perhaps i'll get my local motorcycle shop to install it then.
 
atjurhs said:
Mittzy, what i think i hear you saying is that my plan of just adding it into the current circuit either in parallel or in series won't work, correct? perhaps i'll get my local motorcycle shop to install it then.
Click to expand...
May very well work - But for how long? as the horns will be sharing the available current that the wiring is able to provide - if the horns are receiving enough voltage but not enough current this could adversely effect the life of the horns and or stress to circuitry of the bike.
 
@Mittzy is absolutely correct, you do need a relay. The factory horn draws about 3 amps and the factory switch is just barely able to handle that.

You could trigger the relay and the OEM horn at the same time. The OEM horn switch is switching the negative not the positive wire. So keep that in mind when installing the relay.

It’s a bit involved but really not that hard.
 
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