Author [NL] [FR] [ES] [DE] [SE] [IT] Adding another horn  (Read 9030 times)

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  • Offline HACKLE   au

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    Offline HACKLE

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    Adding another horn
    on: Aug 06, 2017, 10.56 am
    Aug 06, 2017, 10.56 am
        I had read somewhere [in a motorcycle magazine obviously] that the horn on the new Honda Africa Twin was quite loud. Me thinks interesting. So I marched into my local Honda dealer and got the young salesman to get the key for the Africa Twin on the floor. Now Lauchie's a bright lad and thought I wanted to take it for a test ride, sadly no, only want to hear the horn.
         Now my reading was confirmed, it was indeed loud. Didn't have to be very loud to be better than the original on the Trophy. "Order me in one please Lauchie", I say. Well received it on Thursday and promptly put it in the shed on the bench. I'll get around to fitting it soon I think. Well today was soon enough I think.
          Into the shed and remove the two panels above the radiator and the two inside the fairing either side of the radiator. Now I remembered how long it took to fit the exhaust pipes R & D guard when I fitted the crash bars. I wasn't looking forward to going through that routine again. But off it came with its surround.
          Undo horn mounting bolt, leaving it to hang free. Check volume again, terrible. Get new Honda item and attach to the Trophy wires. Sound horn, much louder. Then I think how much better would it be with both working together. Into my spare wires box and out with enough with male and female joiners already on.
          So the end result was, a male into both the existing Trophy female joiners with a double wire out of each of these. So then I had four wires with female joiners coming off the two original Trophy females. One from each then attached to each horn. Result was great, two horns with 105 decibels each. Plenty loud enough now.
           The Honda horn came with a metal bracket, the original had its metal bracket. Now to see if both would fit on the original mounting point. I added a piece of metal the same as the original horn mounting arm to the original horn bracket. By placing one bracket over the other I was able to mount both horns to the original mounting position with the original bolt.
           I had to bend one horn bracket back [towards the engine] a very little bit to clear the inner side of the right fairing. Both horns fitted in the available space behind the R & G Pipe Guard without touching anything.
           Then the fun began to refit all the panels. I might add that the only item that gave me grief was of course the R & G Pipe cover. But after about six or was it eight attempts everything was back in place.
           Now before any of you ask for pictures, I've already broached that subject on a previous post [headlight protector]. So don't ask. If a silly old fool like me can do this simple modification, I'm sure anyone can.
           By the way the Honda Africa Twin horn retails for $44.00AUST. so it's not a huge outlet. And if you don't have the R & G pipe guard on it'll be easy.
           So now you don't have to put up with the lousy original horn. :821: :821:
    HACKLE     I'm too young to be this old.

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  • Offline Coconut   gb

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    Re: Adding another horn
    Reply #1 on: Aug 06, 2017, 02.02 pm
    Aug 06, 2017, 02.02 pm
    Hi Hackle,

    "Sounds" like a good upgrade  :008:

    One thing I would be wary of, is that without incuding a Relay into the circuit,
    you will now be drawing more current ( probably around twice as much  :015: )
    on the original circuit, which passes through the Horn Button contacts,
    and this "could" make them burn out  :012:

    Cheers  :821:

    Last Edit: Mar 28, 2020, 08.54 pm by Coconut

  • Offline HACKLE   au

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    Offline HACKLE

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    Re: Adding another horn
    Reply #2 on: Aug 07, 2017, 12.11 am
    Aug 07, 2017, 12.11 am
    Thanks for that bit of information Coconut. Here I was thinking how smart I was with such a simple add on. Bugger, now I'll have to go back to removing the pipe guard and go through the refitting procedure again. Oh well it's not as if I have a lot of other things to do. Cheers again.
    HACKLE     I'm too young to be this old.

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  • Offline Coconut   gb

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    Offline Coconut

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    Re: Adding another horn
    Reply #3 on: Aug 07, 2017, 06.46 am
    Aug 07, 2017, 06.46 am
    Less hassle than having to do that AND buy & fit a new Horn Button !  :138:


    Last Edit: Sep 11, 2022, 01.07 pm by Coconut

  • Offline HACKLE   au

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    Offline HACKLE

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    Re: Adding another horn
    Reply #4 on: Aug 11, 2017, 11.17 am
    Aug 11, 2017, 11.17 am
    Coconut, after your advise today I undid what I'd done. Took the two horns off and replace just the Honda Africa Twin horn. Just doesn't have the same sound, but will alleviate the problem you mentioned. Still had a pr-ck of a time replacing the R&G exhaust pipe guard and associated plastic surround. Ended up with a small nut and bolt holding the guard in place rather than the plastic piece and screw. Cheers again. :821:
    HACKLE     I'm too young to be this old.

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  • Offline Coconut   gb

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    Offline Coconut

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    Re: Adding another horn
    Reply #5 on: Aug 11, 2017, 08.31 pm
    Aug 11, 2017, 08.31 pm
    If you want to use both horns, it's not difficult to wire them in using a Relay :

    For the benefit of anyone else also reading this Topic :

    A Relay is just a Heavy Duty switch - comprisng an internal solenoid
    ( which draws comparatively little current ),
    and is operated by the original horn wire(s)
    to switch the Heavy Duty relay contacts On and Off,
    removing the risk of "burnng out" the orginal Horn Push Button.   

    In the Diagram below a new Power supply, e.g. direct from the battery
    via an in-line 10A fuse, is connected to Terninal 30.

    A bridge wire has also been fitted between Terminal 30 & Terminal 86
    which will allow the horn to be sounded with the Ignition OFF.
    ( The orginal Trophy Blue wire would not be used and could be taped up ).

    Alternatively, fit the original Trophy Blue wire to Terminal 86, and don't fit the bridge wire.
    The horn will only then operate with the Ignition ON.

    The orginal Trophy horn Purple wire ( Horn Button wire ) is connected to Terminal 85.

    When the Horn button is pressed, the internal solenoid is energised, and causes
    the Heavy Duty relay contacts to close between Terrninal 30 and Terminal 87.

    Terminal 87 is connected to one of the Horn contacts ( which may be marked "+" ),
    and the other Horn Contact ( which may be marked "-" ), is wired to Ground.





    Cheers  :821:
     
    Last Edit: Mar 28, 2020, 08.43 pm by Coconut

  • Offline PhilInAthens   us

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    Offline PhilInAthens

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    Re: Adding another horn
    Reply #6 on: Aug 12, 2017, 02.47 pm
    Aug 12, 2017, 02.47 pm
    Following Coconut's stream of thought regarding concern of overdraw in the switch circuit;  What are the electrical differences between the Honda horn and the Triumph? 

    I assume significant amp draw differences would be the primary worry?  If so, how much difference could be tolerated? 10%? 20%? Less than 10% 

  • Offline Coconut   gb

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    Offline Coconut

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    Re: Adding another horn
    Reply #7 on: Aug 13, 2017, 12.38 pm
    Aug 13, 2017, 12.38 pm
    Horns are often marked to indicate their Current rating in "Amps" ( A ),
    or their Power rating in "Watts" ( W ) .

    The stock Trophy Horn is marked "12V 3A 105dB" :
    ( 105dB represents the maximum volume or loudness of the horn ).



    The Trophy Horn is therefore a 12V ( Volt ) horn drawing 3A  ( Amps ).

    To calculate the Power of the Horn in Watts ( W ) :
    V x A = W, i.e. for the Stock Trophy Horn, 12V x 3A = 36 W.

    I can't find any Power or Current specifications for the Honda Africa horn mentioned,
    but if you have one, it may have similar markings on it somewhere.

    If the horn is not marked in Amps, but is marked in Watts, e.g. "12V / 72 W",
    then to find the Current used in Amps, use the calculatiion W / V = A, i.e. 72W / 12V = 6A
    ( Twice as powerful as the Stock Trophy Horn and drawing twice as much Current ).

    ( Note that "Power" does not represent the Volume produced by the horn,
    but is an indication if it's electrical power ).

    If there are no markings,, you would need an accurate Test Meter to measure and calculate.

    e.g. If you measure the Resistance ( R ) across the terminals ( in "Ohms" ),
    using "Ohms Law" you can use the formula A = V / R
    e.g. If the Resistance ( R ) were 4 Ohms,
    then the current draw of the horn A = 12 / 4, ( 3 Amps ).

    Hope that helps !

    Last Edit: Mar 28, 2020, 08.43 pm by Coconut