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Old 09-10-2014, 01:01 AM   #801
CleanImpreza
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So i ran into a problem when installing them today. pretty nooby at this kinda stuff so bare with me on this. i have two sets of horns that i installed, i basically wired everything up like the diagram a couple of posts above me, but just added two more horns, and basically just vampired some together to get the exact diagram like above (im sure this is correct)
So i hooked everything up, and im not getting anything out of the horns, just the stock one, when i unhook the stock one, nothing... within a couple of days i am going to test the grounds that i used, but what else could it be!?

Also on my horns, both prongs are copper colored, how am i supposed to know which is negative and which is positive? i switched each one but still nothing, so this wasnt the problem but might be after

Edit: Found problem, for some reason one stock horn wire didnt work but the other did.
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Last edited by CleanImpreza; 09-21-2014 at 04:24 AM.
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Old 03-06-2015, 12:40 AM   #802
barrythebum
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I bought the harness from Subiemods for mine and it worked like a charm. Supertones are always win.
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Old 05-20-2015, 12:05 AM   #803
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Thank you, your guide helped me out when I was wiring my supertones up.
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Old 05-31-2015, 12:04 AM   #804
MATR6
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Default How To: Install Supertones

This is probably the wrong thread to post to but I didn't want to start a new thread.
Bought these & was wonder if I can just use the stock wiring in my '15 to install since it has dual horns already.
HELLA 007424801 Twin Trumpet High/Low Tone 12V Horn Kit with Bracket https://www.amazon.com/dp/B000COBK8A..._GUMAvb11GA6KY

EDIT:

Looks like I can plug some male pins into the OEM harness.
40 Pcs Gold Tone Male Spade Crimp Terminals 2mm Wiring Connectors https://www.amazon.com/dp/B009795...Avb1JFZVT4

3:00-3:30 in this subispeed video.

Last edited by MATR6; 05-31-2015 at 07:55 AM.
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Old 08-05-2015, 11:06 PM   #805
BockSTK
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Hey guys, I have been looking at install instructions on these horns for a while, and then I noticed that the prongs on the back of my horns are both copper colored. Does it matter which is positive? There are no marks on the back to indicate which is which. One has "08" stamped on the bolt holding the prong in, and the other has "13" stamped on it. And the other horn is the same way.

Any help would be much appreciated!

EDIT: So I went ahead and just threw them in, and it worked! So either it doesn't matter which is positive and which is ground, or I got lucky. I went off of the way the bracket was mounted to the horns. I put the positive on the top prong, and the ground on the bottom. So far so good.

Last edited by BockSTK; 08-06-2015 at 05:40 AM.
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Old 12-22-2015, 12:48 PM   #806
mercury0x000d
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So glad I found this! I was browsing for info on an unrelated problem, but I've been wanting to upgrade the horn in my 1997 Impreza since... well... back when I had my 1995 Impreza! These will sound much better than the little FIAMM things I bought but have yet to install.

Good writeup, thanks!
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Old 01-06-2016, 04:00 PM   #807
Tbuente
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Is it worth buying a relay harness? Does it really make that much of a difference?
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Old 01-06-2016, 07:54 PM   #808
onsit
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Quote:
Originally Posted by Tbuente View Post
Is it worth buying a relay harness? Does it really make that much of a difference?
It takes all of 10 mins to cut wires to pre-posted lengths. Crimp terminals, and shrink wrap.

A relay costs $3 from an auto store, its a very generic and simple 5 throw relay.
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Old 02-23-2016, 06:46 AM   #809
NewShockerGuy
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Quote:
Originally Posted by Dutch Scooby lover View Post
NOOO

You've read the earlier post by Car vs Driver incorrectly.

He's using 2 of the Supertones, and made 2 of those wiring looms in the picture.
1 for splitting the single 12v+ into 2 12v+'s to connect the S-tones, and 1 to connect the 2 grounds of the S-tones to a ground point.

What you are making there is 1 big short-circuit.

Use the original wire to trigger a 30 Amp bosch relay, and let that power the S-tones
So take the original Horn-wire, and use that on pole 85.
Ground the relay by connecting pole 86 to a ground

Then use a beefy wire (fused) directly from the battery + terminal to pole 30
Connect pole 87 to the Supertones, and ground the Supertones to the chassis of the car.

That way, when U press the horn-button, the stock wiring only has to handle the small current needed to trigger the relay, while the Power for the supertones actually comes directly from the battery, thru poles 30 and 87


I know this is old but figured I would ask since I keep seeing two different ways.

Why would one wire it the way you mentioned above when I keep seeing the following:

#30 goes to the battery
#85 is the ground
#86 ties into the wiring that was attached to your old horns
#87 goes to the horns,

Going to help a friend out but was wondering since your ground and switch wire are reversed compared to the above?

Thanks,
-Nigel
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Old 04-08-2016, 10:47 AM   #810
leveltwo
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Default Grim speed harness

Has anyone tried this plug and play harness?

http://www.grimmspeed.com/grimmspeed-hella-horn-wiring-harness-15-wrx-15-sti/
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Old 07-16-2016, 11:38 PM   #811
GC8Monkey
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Lightbulb

I just used the Grimmspeed harness last weekend to install my supertones. It is really well made and of high quality. The horns are still plenty loud enough for me and a lot better than stock. I picked it up as I liked the idea of it plugging into the stock harness without modification.
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Old 01-15-2017, 03:36 PM   #812
R3dg3cko Rob
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Could the original poster get the images working again? Thanks
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Old 01-15-2017, 04:54 PM   #813
Mulder
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Last login 08-10-2009, doubt it.
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Old 01-15-2017, 05:12 PM   #814
R3dg3cko Rob
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Im not the best at this but it seemed like it should be fairly straight forward.however I'm uncertain of what the 5th and 6th wires on this harness are for. One obviously has to be the trigger wire that attaches to the existing withing but which one and what is the other one for? They have male and female bullet connectors.


Last edited by R3dg3cko Rob; 01-15-2017 at 06:45 PM.
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Old 01-18-2017, 12:10 PM   #815
MaroonRoo
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For the minimal amount of extra cash, go ahead and get a pre-wired harness. Install took me 20 minutes!
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Old 01-18-2017, 12:16 PM   #816
R3dg3cko Rob
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Quote:
Originally Posted by MaroonRoo View Post
For the minimal amount of extra cash, go ahead and get a pre-wired harness. Install took me 20 minutes!
I wasn't aware that this one wasn't plug and play tbh - It's saying to connect the 2 bullet connections to the existing wires but I'm not sure which ones. I've only disconnected the center stock horn at the moment.

One red and one black wire would indicate a live and negative/ground wire but I'm not sure which gets connected to what from the original wiring.
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Old 01-23-2018, 10:18 AM   #817
Charlie-III
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Quote:
Originally Posted by NewShockerGuy View Post
I know this is old but figured I would ask since I keep seeing two different ways.

Why would one wire it the way you mentioned above when I keep seeing the following:

#30 goes to the battery
#85 is the ground
#86 ties into the wiring that was attached to your old horns
#87 goes to the horns,

Going to help a friend out but was wondering since your ground and switch wire are reversed compared to the above?

Thanks,
-Nigel
Late answer, but are you asking about pins 85 & 86? If so, they feed the coil in the relay, there is no polarity, so it doesn't matter which pin connects to ground and which connects to the old horn wire.
Since these type horns are also just a coil, there really isn't a polarity for them either if they have 2 wire connections. If only a single wire then the mounting point of the horn is the ground.

This reply is more to answer the question others may have.
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Old 07-23-2018, 11:02 PM   #818
Csanders
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Dumb question: For testing purposes ONLY, would the Hella horns work without grounding the horns to earth ground?

(2013 Impreza)
On the relay I have: #85 on the negative side of the battery, #30 to the positive side of the battery, #87 to the horns positive side, and #86 to the old signal wire (blue connector on old horn).

I bought a cheap wiring harness from Amazon but it failed to work completely wired up (with grounds too) so I decided to wire it how I saw it posted on here. So before I finalize my wire placement I decided to test the horn without the ground on the horn and it did not work. To me this should work because earth ground is just protection in this instance.

Its aggravating that Hella has terrible wiring diagrams that seems to be backwards from how everyone else shows it on the internet. Plus they don't have product support. It sucks for people like me who don't know much about wiring.

Last edited by Csanders; 07-23-2018 at 11:10 PM.
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Old 07-24-2018, 08:15 AM   #819
Siress
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Quote:
Originally Posted by Csanders View Post
So before I finalize my wire placement I decided to test the horn without the ground on the horn and it did not work. To me this should work because earth ground is just protection in this instance.
The "ground" is not protection in this use case, it's the negative of the horn circuit.
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Old 07-24-2018, 10:52 PM   #820
Csanders
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Default How To: Install Supertones

Quote:
Originally Posted by Siress View Post
The "ground" is not protection in this use case, it's the negative of the horn circuit.


Awesome, I got it. So I didnít end up using the relay: I took my positives to the old horn signal and I took the ground wires back to the negative side of the battery.

I tried using the old horns negative wires but it failed to work. With the oem horn connectors on the new Subaruís itís hard to tell whatís going on plus itís even harder to wire a new horn without cutting the oem connectors. Regardless itís working now. Thank you.

Second attempt to reply. First time it kept logging me out.
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