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  1. archerwin's Avatar
    archerwin
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    August 3rd, 2009 01:32 PM #1
    I bought a set of Bosch EC9C fanfare horns and I want to DIY the upgrade on my Honda City.

    Do I have to buy a relay? What are the steps needed?
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    August 3rd, 2009 02:28 PM #2
    Quote Originally Posted by archerwin View Post
    I bought a set of Bosch EC9C fanfare horns and I want to DIY the upgrade on my Honda City.

    Do I have to buy a relay? What are the steps needed?
    No relay needed. Just directly replace existing horn with the Bosch horns. You just might need to wire the ground wire to the body of the car.
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    archerwin
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    August 4th, 2009 11:13 AM #3
    ghosthunter,
    hello! Thank you! Stupid question: The EC9C has 2 horns, you connect it in parallel right? then the 2 horns will be grounded to the body of the car?

    thanks again!
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    August 4th, 2009 12:36 PM #4
    Quote Originally Posted by archerwin View Post
    ghosthunter,
    hello! Thank you! Stupid question: The EC9C has 2 horns, you connect it in parallel right? then the 2 horns will be grounded to the body of the car?

    thanks again!
    yup... in parallel.
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    August 6th, 2009 06:42 PM #5
    thanks again!
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  6. OTEP's Avatar
    OTEP
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    August 6th, 2009 07:06 PM #6
    Tried without a relay and the results weren't spectacular. Had a relay installed. Also relocated the horn to the driver's side where it can be positioned higher and better protected from floods. The power comes directly from the positive terminal of the battery. Added wire hidden using OEM-style wiring covers.

    Yes, ground is direct to body.

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    August 7th, 2009 10:55 AM #7
    OTEP,
    can you take a photo of the set-up? if possible only. thanks!
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    Type 100
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    August 7th, 2009 03:29 PM #8
    Don't the Bosch horns already come with a relay in the box?

    I've had my horn swapped twice (first to a Stebel TM80 Magnum, next to a Bosch Windtone, both twin-tone horn sets) and they've always had their own relays thrown in.

    You'll probably need to remove the bumper. That's where the stock horn resides on GD Cities and Jazzes. The Bosch horns I got have a nice high-mount bracket to protect them from deep floodwater that could easily kill them - that's what happened to my beloved Stebels. I basically had the horns relocated to the engine bay, on one of the brackets for the A/C lines.
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    August 7th, 2009 04:54 PM #9
    The Bosch EC9C doesn't come with a relay though.
    Even inside the engine bay, the sound is still ok? not muffled?

    thanks!
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    August 8th, 2009 06:12 PM #10
    Ok lang sa engine bay. That's what I did for the Patrol and Jimny because they will be used to ford water. No problem sa tunog.

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Honda City Horn upgrade DIY Questions