we should make this sticky
I compliled a sort of mix of the best ways here:
Use them once to save your A$$ from the soccer mom in the Escalade and the dip in the $60,000 truck he just got after selling his Civic and so does not have much control or concern and they are worth their weight in gold...just one use paid for them...
Hi Had to pipe in a bit, there are 2 types of Hella's
HL85115 German Hellas High Tone 500 Hz Low 375 at 118 db
HL85315 Indian Hellas are High 375 Low 300 at 113 db
I like the German ones better...most of the eBay ones are the Indian ones...
See
http://www.rallylights.com/hella/supertone_horn.asp
Also they have a cool diagram and they are a good vendor, used them for a few years...
See:
http://www.rallylights.com/useful_info/horn_wiring.htm
The PDF install link below is well done but does not use the direct connect to battery option...:
http://www.ragingfish.com/genvibe/horn-install.pdf this does have some good photos of the install part, I would just wire it differently as he did a month after the first install
That is the easiest way to do it....and it works fine. However, powering them off the battery, using the relay, ensures that the horns are receiving all the power they need for max volume, even the poster ragfish decided to redo them after a month and did it the right way with the relay….
On the relay:
BOTH horns must be wired to 87; 87a is not used (unless you like to drive around with one horn on all the time).
The battery positive should be connected to pin 30
you should now have 85 and 86 left.
85 goes to ground, and 86 goes to the stock horn wire (you can wire it the other way around, it does not matter the circuit just needs to be completed to trigger the relay)
finally, the horns must be grounded
Parts list...
8 female terminals: 4 for the relay and 4 for the horns.
1 male terminal: to plug into the stock horn connection.
4 ring terminals: 2 to ground the horns, 1 ground the relay and 1 for the (+) battery terminal from the relay.
A roll of wire...14 gauge is more than enough.
Some zip-ties and small wire loom to keep things neat.
In addition to crimping the terminals, I also used heat shrink-wrap to insult the terminal heads and to help prevent them from being pulled off the wire.
LAST NOTE: Be careful when drilling the one mounting hole you will need, one is there from the stock horn and one is needed for the other, you will be drilling right hear the radiator just put something behind where you are drilling so you do not drill the radiator!
Linear Mode
