1. Couldn't make it to California for the To Go Before conference? No problem - watch it live here.

Need advice on upgrading horns to Hella Supertone

Discussion in 'Gen II Prius Modifications' started by igme, Aug 10, 2009.

  1. Offline

    igme Junior Member

    Start a Conversation
    Member Since:
    May 22, 2009
    Posts:
    7
    Likes Received:
    0
    Location:
    Delaware
    Your Vehicle Year:
    2009 Prius
    Model:
    N/A
    I just bought Hella Supertones to upgrade the stock horn in my 09 prius. Has anybody installed these on their car? Will the stock wiring be able to handle the amperage of the horn or do I need to "upgrade" wiring on the car. If I need to upgrade the wiring, I need to "tap" a line to the positive terminal of the 12v battery. Does anybody have any advice as to where I could "tap" the + of the 12v battery? Any helpful input is welcome.

    Thanks.
    igme, Aug 10, 2009
    Like Reply Share #1
  3. Offline

    Neena2007 New Member

    Start a Conversation
    Member Since:
    May 11, 2008
    Posts:
    19
    Likes Received:
    2
    Location:
    SJ, CA
    Your Vehicle Year:
    2008 Prius
    I did the Supertones install on my Impreza. Really easy. I don't see it being any different on the Prius. So, you do need a relay and a fuse to make sure they'll work properly. Your Supertones will not sound as good & loud without the relay.

    See attached diagram....this is all you need.

    Attached Files:

    Neena2007, Aug 11, 2009
    Like Reply Share #2
  5. Offline

    igme Junior Member

    Start a Conversation
    Member Since:
    May 22, 2009
    Posts:
    7
    Likes Received:
    0
    Location:
    Delaware
    Your Vehicle Year:
    2009 Prius
    Model:
    N/A
    Thanks. I just installed it today. I was able to tap to the + of the battery through the relay/fuse box in the engine compartment. I connected it to the positive terminal screw adjacent to the bar where you connect the + jumper cable.

    I took longer in finding mounting holes for the horns itself because the much larger the diameter of the horns are compared to the stock ones. I ended up using the stock location in the center for 1 horn and for the other one I had to use a hole just below that. The horns are positioned back-to-back facing the sides and not facing forward as I had hoped. I was trying to avoid drilling holes on the body/frame.

    Took me about 2.5 to 3 hours to do.
    igme, Aug 11, 2009
    Like Reply Share #3
  7. Offline

    Neena2007 New Member

    Start a Conversation
    Member Since:
    May 11, 2008
    Posts:
    19
    Likes Received:
    2
    Location:
    SJ, CA
    Your Vehicle Year:
    2008 Prius
    Did you use a relay?
    Can you upload pics to see the install?
    Thanks.
    Neena2007, Aug 12, 2009
    Like Reply Share #4
  9. Offline

    macmaster05 Senor Member

    Start a Conversation
    Member Since:
    Sep 27, 2009
    Posts:
    3,903
    Likes Received:
    557
    Location:
    USA
    Your Vehicle Year:
    2009 Prius
    Model:
    N/A
    bump, i wish the OP was around, i want to see this
    macmaster05, May 29, 2011
    Like Reply Share #5
  11. Offline

    Rae Vynn Wickedly Fun Prius Driver

    Start a Conversation
    Member Since:
    May 21, 2007
    Posts:
    6,015
    Likes Received:
    673
    Location:
    Grays Harbor, WA, USA
    Your Vehicle Year:
    2007 Prius
    Model:
    Two
    We put Camry horns in ours, which sound way better than stock Prius. Very little needed to be done to make them fit - just a tab had to be bent out of the way on the center mount. Wiring handles them fine.

    Camry horns were just a few bucks at an auto wrecking yard. Maybe $10 for the pair.
    Rae Vynn, May 30, 2011
    Like Reply Share #6
  13. Offline

    stefano5777 New Member

    Start a Conversation
    Member Since:
    Mar 15, 2011
    Posts:
    380
    Likes Received:
    46
    Location:
    St. Petersburg Florida
    Your Vehicle Year:
    2005 Prius
    Model:
    N/A
    Debating on installing an air horn in the rear bumper of my Prius for when all the jackasses who like to tail gate get close.This way I can say hello nicely :D
    stefano5777, May 30, 2011
    Like Reply Share #7
  15. Offline

    BAllanJ New Member

    Start a Conversation
    Member Since:
    Dec 9, 2008
    Posts:
    660
    Likes Received:
    67
    Location:
    Kingston Ontario
    Your Vehicle Year:
    2009 Prius
    Model:
    N/A
    Because deploying an oil slick (a la James Bond) would be so 1960s and not in keeping with the Prius ethos.:D
    BAllanJ, May 30, 2011
    Like Reply Share #8
  17. Offline

    LIPriusFreak Can I haz JDM?

    Start a Conversation
    Member Since:
    Apr 30, 2011
    Posts:
    441
    Likes Received:
    30
    Location:
    Long Island, NY
    Your Vehicle Year:
    2006 Prius
    Model:
    N/A
    and here I was thinking my roof mounted rocket launcher was borderlining on "excessive" :eek:
    LIPriusFreak, May 31, 2011
    Like Reply Share #9

Share This Page