So unlike the ones who have installed a complete horn replacement using either the Hella Supertones like D113 and Koup SXR, or the FIAMM high/low like BigE, or even the PIAA ones, I decided to keep the stock horn and just add a second low tone - got the FIAMM Freeway Blaster 130db 405hz horn.
So I made my way out to CanadianTire and picked up the horn for $28, and having run out of most of my connectors I bought quite a bit of stuff..
Things you will need
- New Horn (FIAMM 405hz low tone)
- Female Spade connectors (multiple)
- 8mm Ring Connectors multiple
- Standard Automotive Relay
- 16 AWG Wire
- Heavy Duty Inline Fuse holder
- 10 or 20 Amp Fuse (depending if you are doing 1 or 2 add on horns)
- 18-22 AWG Wire Splicers
- Electrical tape
Tools you will need
- 8mm Socket
- 10mm Socket
- Flat + Philips head screw drivers
- Wire cutters and crimps
First: Wire Prep (Indoors)
1. Used the provided ground ring and female spade and connected it to the horn
2. Prep the relay
87 - Positive to New Horn (1 foot) (female spade - female spade)
30 - Positive from Battery with Inline fuse (3 feet) (female spade - inline fuse holder - 10mm ring)
86 - Line to tap into old horn positive (pink) (6 inches) (female spade - open cable)
85 - Ground (1 foot) (female spade - 8mm ring)
Verify that the cables have connectivity from end to end with a multimeter.
Second: Head out to the car and remove the lights and bumper
Bumper Removal Video - Thanks to BigE! (-> http://www.forteforums.com/forums/body-kits-appearance/1883-bumper-removal-horn-replacement.html
1. Remove 3 plastic screws underneath the bumper and a 8mm in each wheel well
2. Remove 4 top plastic above grill
3. Remove headlight bolts
4. Tape below headlights and the top corner of each light
5. Unplug both headlights and remove
6. Pop the 3 tabs under each headlight
7. Tape edge between bumper and fender
8. Place rag beneath bumper as it might fall on the next step
9. Pop from white clip where bumper meets fender
10. Pop 3 tabs between bumper and fender with flat head (I did not need to do this the bumper popped off at step 9 for me
11. Disconnect fog lights if you have them
12. Remove bumper from front - hold from beneath the headlights
Third: Mount the new horn.
1. Mount the new horn using an existing bolt and connect the 1 ground 8mm ring from the relay to the same bolt after scraping the paint off. (relay port 85)
Fourth: Connect all the cables.
1. Splice into the pink cable connected to the existing horn (do not cut if you intend to use the existing horn) (relay port 86)
2. Connect the female spade to the new horn (relay port 87)
3. Connect the female spade to the relay and the opposite end positive ring terminal with the inline fuse to the battery (relay port 30)
Fifth: Test the horn!
( i had a ground problem where I did not scrape enough paint off)
Sixth: Wireloom all the cables and mount the relay to a hole with a wire tie. (Wire tie wirelooms if necessary)
Seventh: Test the horn again!
Finally!.. Put the bumper and lights back on/in!
Here is a short video (WATCH IN HD for better sound) showing the differences between stock / low-tone / stock+low tone! I will get around to getting a video of me actually honking the horn.. its wayyy louder!