('14-'18) Stuck with my Hella wiring - Subaru Forester Owners Forum
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post #1 of 7 (permalink) Old 05-09-2019, 12:35 PM Thread Starter
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Stuck with my Hella wiring

I was trying to follow this tutorial, but am stuck. Hella horn install with relay and fuse.

I've gotten to the point where I can unconnect the old horn. Then I'm not clear what happens. I have a relay harness, I know where everything goes .....well except two things. 1. the new horn connections.....that activate the horn button and where exactly do those get connected.
2. On the positive battery terminal, does it matter which one of the connection I use?

Thank you for any help

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post #2 of 7 (permalink) Old 05-09-2019, 01:13 PM
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@8lackie use @Poseidon wiring diagram. It shows everything you need to know.

As to where to connect at the +12V battery terminal. I would connect at the bolt near the clamp.

Bobby...

['07 FSXT MODding Journal] ['03 X MODding Journal]


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post #3 of 7 (permalink) Old 05-09-2019, 03:02 PM Thread Starter
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Thanks Bobby,

That is the one I was following. I get stuck at where the connectors go for the horn button. It's not clear where the "stock wires to horn" are. Or do I cut the wires and splice them into the thingy in my first photo -which I might add looks like it terminates....I've not been able to separate it from itself, if that makes any sense?

Addendum: It may be that Poisidon explains iit in this 3rd paragraph under his diagram, but I still don't understand it.

"I connected the wire from the center stock horn to #86 . Relay post #86 was the part that was unclear to me. I kept trying to figure out how to splice directly into the wires from the horn button. I finally figured out that I just needed to use the stock horn wire from the horn itself. When that wire is activated by the horn button, it activates the aftermarket relay and horns."

8lackie

Last edited by 8lackie; 05-09-2019 at 03:06 PM. Reason: add'tnl information
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post #4 of 7 (permalink) Old 05-09-2019, 04:14 PM
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@8lackie looking on the factory wiring diagram, you have 2 factory horns. The trigger is +12V, so you'd wire one side of the relay coil you're installing to ground & connect one of wires from the factory horn to the other relay coil. That completes the relay circuit, so when the horn button is pressed, the relay will operate.

Bobby...


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post #5 of 7 (permalink) Old 05-09-2019, 04:23 PM Thread Starter
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I figured it out. It was where to plug in the horn button relay. I just cant seem to pull the thing apart to plug in to it. I suppose I could just clip it and then connect them that way.

About 3:15 on this video
https://www.subispeed.com/2015-subar...i#.XNRnbth7mCg

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post #6 of 7 (permalink) Old 05-10-2019, 06:06 AM
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@8lackie -
When you run your positive wire from the battery terminal, make sure you have a fuse on it!
An inline fuse with a spade connector works well, and ideally you place it near the battery connection.
I picked up one wired in with a terminal lug already connected.
Since you need to route a wire around some sheet metal edges to power the horn, the fuse will blow if you get a short, rather than your wire melting or starting a fire.
It will also allow you to pull the fuse to stop the horn from sounding if the relay sticks on.
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post #7 of 7 (permalink) Old 05-20-2019, 11:35 AM Thread Starter
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Can you hear me now?

I bought a harness from Amazon.
iJDMTOY (1) 12V Horn Wiring Harness Relay Kit For Car Truck Grille Mount Blast Tone Horns (Actual Horn Not Included)
which has a fuse built in (near the battery connection, as you recommended) What was throwing me was the connector for the horn, which looked like, what I now know to be a bullet connector and I needed to connect it to a female spade. I had to jerryrig a male connector to the bullet connector so I could plug in to the horn circuit.


I hooked up some HELLA 012010801 Blue Trumpet Horn Kit, 12 V, 400/500 Hz (Universal Fit). They're loud like a boss.
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