When I had them in my subaru, I had pretty much a ground, tapped power from my original horn and the mounting brackets in the middle of my grill.

Sorry to bring up an old thread but I'm in a similar situation.. Has any one installed these in a DSM yet?

Let me know if you NEED pics and I will get them, but this is wha to doI have a 1G Eclipse so there may be small diferences such as wire color or layout.)
1. Gather material. You will need: Female blade connector, 1/4" size; wire of appropriate size; wire cutters and crimpers; butt connectors; a fitting to connect the power wire to the battery, I used a ring terminal; a way to put a fuse on the power wire from the battery, I used an inline tube style fuse holder that I had laying around from a trailer connector install but you can buy whatever style you want, maybe a blade style that people use for stereo systems, my kit said to used a 16 amp fuse; and, of course, screwdrivers, wrenches, etc.
2. Figure out where to mount the relay. Try to use an existing bolt/screw hole.
3. Figure out where to mount your Hella horns. You could mount them where the stock horns were but I like to mount them where the sound will not be blocked by the body work. I mounted mine just behind where the fog lights used to be.
4. Do not conect anything to the battery until the very end! Run you power battery from the relay pin-87 to the Hella horns. Run a ground wire from the horns to a proper ground location, I used the mounting hole/bolt of the horns. Used the appropriate connectors as needed.
5. Cut the wires from the factory horns. You only need the positive and negative lead from one horn to go to the relay. Run the positive wire from the factory horn to pin 86 of the relay and the negative to pin 85. This circuit is what controls the relay to allow current to the Hella horns. Again, use the appropriate connectors.
6.Finallly, connect you battery power to pin 30 of the relay.
7. Give it a honk to see if it works.
I hope this helps. Let me know if you need more info or pics.

That was not supposed to be a frown in my previous post. It was a period then a parentheses. ignore.

ONE MORE THING: You need to splice the two power wire going to the horn before you connect them to the relay. That should have become obvious but I just wanted to avoid any confusion.

I had Supertones...you dont even need the relay. There are two prongs on the back of the horn...hook the power wire from your stock horn to one of the prongs and ground the other. Doesnt matter which side power and ground goes on. That simple...no need for the relay because the stock horn relay will suffice.

autodsm said:

I had Supertones...you dont even need the relay. There are two prongs on the back of the horn...hook the power wire from your stock horn to one of the prongs and ground the other. Doesnt matter which side power and ground goes on. That simple...no need for the relay because the stock horn relay will suffice.

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How long have you had your horns hooked up that way? Got any picture?

Pics? Thanks

DSMnOOb00 said:

How long have you had your horns hooked up that way? Got any picture?

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They are on my other car, which I have had it hooked up that way for 3 years without a single issue. Theres a bracket on the back of the supertones, just take out your old horns and use that space to bolt the new horn to...put the power from the stock horn onto one of the prongs for the new horn, then just run a ground wire to a bolt on the hood latch or wherever you want.

Somebody should do a write up on it for future questions, plus we need more write ups in general! my $.02

The install is pretty straight forward though....its a two wire install and one of the wires is already there (12v wire)

If you don't use the relay then the horns will not reach their full volume! They will work but not to their potential. Wire in the relay allows you to bypass the factory restriction on voltage and amperage. Its worth it.

Was there something wrong with the OEM horn?

And yes, I'm being intentionally thick in hopes that someone will explain to me their desire mod their horn.

Both of my horns had died so ir replaced them. I got these horns so I could motivate people to stop cruising in the passing lane.

I've trying to get some pics up but I've been busy because classes started recently and my computer is having issues uploading photos. I'll keep at it.

Is the horn switch connected to positive or a ground?

Is this the way we need to wire the relay?

http://sickspeed.com/pages/wiring_files/horn_install.jpg

PieEyedPiper said:

Was there something wrong with the OEM horn?

And yes, I'm being intentionally thick in hopes that someone will explain to me their desire mod their horn.

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They're red!

serviceguy said:

They're red!

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Ha!

I've been seeing more of these things. Must be hella contagious.

Any useful information would be great.

eclipse420ags said:

Any useful information would be great.

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Right away, sire

Hella Supertones have two wires, positive and negative. Positive goes into the FACTORY HARNESS and negative runs to ground.

Here you are:
NO need for relay, just the Horns and (4) wires you make - (2) for Positive leads, (2) for Negative leads. I recommend soldering the positive leads to the OEM harness wires -hope this makes sense.




-Thoroughly ripped off/copy&pasted from evoM

just did an install of the sickspeed ones not long ago. pretty easy, this is where i mounted mine.

Lol @ those horns..

Post a video so I can hear these bad boy's in action, lighting up the Prius that just cut you off...

DIMONDSTAR77 said:

just did an install of the sickspeed ones not long ago. pretty easy, this is where i mounted mine.

You must be logged in to view this image or video.

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Any reason why you have t-bolt clamps on your intake?

Because race car. i'm running 40psi nad i don't want to blow the air filter off. and the horns added 10hp. whatever, the horns where a gift, because the o.e. one stoped working, and the t-bolt clamps i had extra one laying around so why not. and the horns are by far much louder. so "beep beep motherf*cker"