Harley Horn electrical question - VTXOA
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post #1 of 19 (permalink) Old 05-24-2011, 04:17 PM Thread Starter
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Harley Horn electrical question

I'm doing a mod where I replace my stock horn with the 'cow bell' harley cover on the left side of the engine. I read wanted to replace the stock horn with something better and found Stebel makes a replacement horn to fit inside the 'cow bell'.

My question now is; "Will this Stebel horn work with the VTX wiring and horn switch or does Harley have something special about it that would not allow a direct replacement using this horn?"

Here's the horn I'm talking about:

Amazon Amazon

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DESCRIPTION TM 80/1 high/low tone TM 80/2
Part number 11451122 / 11451222 11452122 (11452124 box)
Nominal current 12 o 24 Volts

Stebel is located in Italy.


I would think this would just plug and play with no issues, I just don't want to burn out my horn switch so I'm posting in case anyone knows.

Thanks.






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post #2 of 19 (permalink) Old 05-24-2011, 05:17 PM
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That's because the HD one leaks oil!!! LOL, I am sorry I had to say this!!!!



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post #3 of 19 (permalink) Old 05-24-2011, 05:24 PM
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It depends on the draw. Since so much comes through the starter switch I would consider a relay. that would be about it. you could still use the honda connection for the horn but for a trigger only.
just a thought

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post #4 of 19 (permalink) Old 05-24-2011, 05:55 PM Thread Starter
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Red face Need more 'spla-nin' please

Quote:
Originally Posted by dirtdobber View Post
Quote:
It depends on the draw
. Since so much comes through the starter switch I would consider a relay. that would be about it. you could still use the honda connection for the horn but for a trigger only.
just a thought

Draw?
"Trigger?"

Please pardon my guessing:

I guess the "draw" is the amps??? I don't own an amp tester but what is that going to do for me anyway (knowing the draw?).

I suppose if I knew the stock amps of the stock horn I can compare and see if this new horn draws more amps? If they are the same it's all good????


If it draws more amps do I simply buy a relay rated for those amps?

Does the relay make the horn safe then to hook up to stock wires?

Not sure what is meant at all by "Trigger" or what the starter switch has to do with the horn button???

ME BRAIN 'ERTS!!!


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post #5 of 19 (permalink) Old 05-24-2011, 07:02 PM
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USE your factory wiring as a TRIGGER CIRCUIT ONLY...PUT A RELAY IN THE CUIRICT.......Get your horn power straight from the battery...THAT is what i did...in fact the OEM horn is still on the bike and functional with the STEBEL NAUTALIS...YES ITS LOUD............ESKIMO
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post #6 of 19 (permalink) Old 05-24-2011, 08:32 PM
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Using the factory wiring as a trigger only implies that you are going to use the hot (positive) as a starting point to the relay. When you push the horn button it sends a electrical current to the relay which will cause the relay to close and get it's power from the battery. It triggers the relay.
Since you will be using a single horn use this

and forget about the connection to the 2 horns. red representing hot/positive; green for ground.
That's about it

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post #7 of 19 (permalink) Old 05-24-2011, 09:46 PM Thread Starter
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Learn somthing new every day. . .

Thanks!

I'm totally over my head with trying to read a wire diagram, so forgive the questions :

Looks like I need a 4 terminal relay but not sure what amp rating to buy?

Also don't know what gauge wire to buy?

In the diagram it shows a 15 amp fuse somewhere along the line to terminal 30/51. I guess they sell fuses that mount in the wire?

OK, the OEM hot wire (lime green line in diagram) goes from button to terminal 86, Where does the ground wire from the horn switch connect to, the ground wire shown on 85?


The ground line from the horn (green line in diagram) shows going somewhere, so does this mean any ground on the bike or ??

I'd understand if you guys just leave me hangin 'cuz I'm dumber than a rock.



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post #8 of 19 (permalink) Old 05-24-2011, 10:38 PM
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Quote:
Originally Posted by House O' Pain View Post
Thanks!

I'm totally over my head with trying to read a wire diagram, so forgive the questions :

Looks like I need a 4 terminal relay but not sure what amp rating to buy?

Also don't know what gauge wire to buy?

In the diagram it shows a 15 amp fuse somewhere along the line to terminal 30/51. I guess they sell fuses that mount in the wire?

OK, the OEM hot wire (lime green line in diagram) goes from button to terminal 86, Where does the ground wire from the horn switch connect to, the ground wire shown on 85?


The ground line from the horn (green line in diagram) shows going somewhere, so does this mean any ground on the bike or ??

I'd understand if you guys just leave me hangin 'cuz I'm dumber than a rock.


To answer your questions as they came:

1. Your relay should have a higher amp rating than you equipment, so your relay doesn't burn out from normal use.

2. 14 AWG should be fine to run http://www.windsun.com/Hardware/Wire_Table.htm

3. You can buy an inline fuse that you can connect in the wire or buy wire with a fuse in it from most auto stores.

4. You can ground it to any other ground on the bike (please correct me if I am wrong, I will need to do some changes on mine)

Hope this helps you.
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post #9 of 19 (permalink) Old 05-25-2011, 11:23 AM
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To make this simple lets do this:
Hot wire from horn goes to 86 (trigger)
Horn ground goes to ground to new Horn
Ground from relay goes to any good ground 85
In line fuse goes to battery. You can get a inline fuse at radio shack if ya prefer with or without wire installed. this go's to 30/51
14 awg wire will do just fine for the horn, you can get cut to length at auto parts stores, lowes hardware, opr a small spool at radio shack
I always use a 30 amp relay. There are 2 trigger inputs on them. I will use both through time. On my bike I have my radio to 1 and my cig lighter on another. So If you only use 1 for the horn you will have another for something else. However if you do add 2 inputs you need to add separate fusees for each.

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post #10 of 19 (permalink) Old 05-25-2011, 12:20 PM Thread Starter
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Exclamation THANKS!

dirtdobber,

Thanks for breaking this down for me. Seems pretty easy now that I understand terminology and connections and what the relay does.

Thanks to all who responded.

Heading out to Radio Shack now. . .

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