HN-18 Horn Assorted , One Size

This horn can only be installed as a 2-wire horn. If installed as a 2-wire horn the chirp for the locking car and the signal to the horn from the security alarm will no longer work. To continue to use this horn (in my case pass state inspection) as a 2-wire horn will require that a least a 1N4001 1A 100V diode (or a 1N5401 3A 100V both found at RadioShack) be soldered across the horn connectors to protect the contacts inside the horn and the horn button on the steering wheel. Yes, you will need to cut off the existing connector to make the short pigtail coming off of the head light even shorter so you may want to find a similar connector (I could not find a spare one on the wire harness) or proceed to the preferred solution offered as a challenge below.If you want a challenge, the plastic connector housing on the original 3-wire horn contains a circuit (sealed in the green material) that still should function. This circuit can be removed without damage by using a 1/4" drill to drill about 1/8" down to disconnect the 3 plastic rivets that hold the circuit board to the horn. With the circuit assembly removed from the horn your attachment options are endless. I suggest that you attach short wires from the circuit board assembly to the replacement horn, since you may need to replace that horn in the future.With the connector disconnected from the old horn, test the leads with a meter or small test light to see if it responds to the horn button being pressed and the remote lock. Now test the horn to see if it will work. If it does, the problem will more than likely continue to be intermitten due to oxide build up over time on the contacts inside the horn. Replace the horn with a cheaper model than this one (I found several before I mistakenly bought this one), since there is no point to pay up for an aftermarket OEM horn that does not exist.Just an FYI, the horn is actually powered by a NPN BUZ11 transistor. This is contrary to most who incorrectly think that a relay is required to switch power to the horn. In fact, the horn has similar functioning as a relay except when the coil is actuated it resonates a small metal dowel that is connected to a thin metal disk to make the horn sound. Have fun.On Wednesday, November 16, 2011, Dantuono, Joey <jdantuono@smpcorp.com> wrote:> Hi Todd,>> HN18 is indeed a conventional horn, that requires an external relay. At this time we do not have a unit with an internal relay. Sorry for any confusion.>>>> Joe Dantuono>> Quality Assurance

Shipped fast. Seemed to be made well, and pretty easy to install. Low tone and high tone horns on my son's 2001 Ford f150. This replaced the low tone horn. Loud as original, but tone seemed to be a little higher and has slight tinny sound which is reason I deducted one star.

It was hard to find a replacement for my daughters horn on her 2005 Dodge Neon. Wish it was a little louder but installed with no problems.

It's a horn. It has nearly the same sound as the original, mounts correctly, and the electrical connections are correct. In the end, this is what a replacement should do and is 1/3 the money of the dealer part. No way to know the durability but would have to burn through 3 to break even so looks like a deal.

Easy install, loud like a horn should be!

What's to say, it's a horn..... I bought both the hi and lo tones and they sound great