SoundOriginal12Volt Loud Car Air Horn Big Truck Horn 125db with Automotive Relay Electric Horn for Truck Car Motorcycle (Red)

The media could not be loaded.  This horn works well and is loud. The problem is in the wiring diagram and wiring colors for the relay.FIRST OF ALL, DO NOT HOOK UP THE WIRES AS STATED ON THE BOX OR YOU WILL BE RUNNING ALL 15A+ THROUGH YOUR HORN BUTTON. THE WHOLE POINT OF USING THE RELAY IS *NOT* TO DO THAT.So, to correctly wire the horn relay-FIRST: the black wire is not supposed to be tucked into two relay contacts. PULL OUT one end of the black wire (that is tucked into two places) such that there are two separate black wires in two separate relay points. I.e., pull the one side OUT of the one contact where there are two black wires tucked in. I.e., you want to separate black wires coming out of two separate relay points.SECOND: There are two red wires coming out of the red. You are only going to use ONE. You can clip off one of them or cap it off. (Doesn't matter which one but decide whether you can use the female spade plug connector on the one red wire or if you'd rather just have the other bare red wire).THIRD: You would think the opposite black and red wires are battery power wires BUT NO, they are the switch wires. YOU CAN TEST THIS FOR YOURSELF BY TOUCHING THE OPPOSITE BLACK AND RED WIRES TO A 9V BATTERY. YOU WILL HEAR THE RELAY SWITCH CLICK. That's how you know those are the switch wires. Had power been connected to the other opposite pair (yellow/other black), it would have allowed the power through.FOURTH: The yellow and other black opposite side wires are for the positive power. They are essentially running in-line from [the positive terminal of] the BATTERY to the POSITIVE (+) terminal on the horn. I.e., one wire goes to the battery (you should have an in-line fuse in between), and the other wire goes to the positive terminal of the horn.FIFTH: the negative terminal of the HORN just gets grounded to the frame somewhere- wherever it's convenient. It just needs to be grounded. Nothing else needs to be grounded by you.If I have time, I'll draw a diagram sometime.

Just as loud as a Wooloo. I took mine apart and put pump under side cover and horn for in harley factory bell. I added the long tube and wire.. can't even tell..

Easy installation and great sound.

Exactly as described

The instructions do not match the wiring diagram which has print that is literally microscopic! What you have are 2 Red Wires, 1 Yellow & 1 Black. The diagram references Blue & Green wires, which do not exist. The diagram illustrates an "electronic control " which I guess is the black relay box and below it the " connect the line box " which I assume is the Yellow square connection box. The diagram of the wires coming out of the connection box shows Red wires plugging into both the + & - posts of the horn with a Yellow wire going to the +? & a Green wire going to the -?. Then there is a single (non-existing) Blue wire going to the " steer device button ", horn button?Now for the Connection Guide1. Red line connect with Battery2. Black line connect with Battery3. Blue line connect with the button of the horn4. Green Line connect with the high frequency nom5. Yellow line connect with the low frequency nomIn there is no frequency indiaion, please repeat the above4 & 5 step to find the best sound.My guess is that 1 Red wire is connected to the + battery post and the Black wire to ground. The other red wire to the horn ( + or - negative posts not specified ) & the yellow wire plugs into the existing horn wiring harness.

The sound is just a little higher that the standard horn. But good and easy to install

Easy install and very loud. Only complaint is lack of adequate mounting hardware and usable instructions. Had to fiddle a bit to mount it, but can still recommend it for the money.

This horn is extremely loud, definitely neededOn a motorcycle. Installing can be difficult if you are not handy with tools and wiring. Definitely add the relay on your motorcycle.Very impressed with the quality, price was outstanding. Highly recommended

The media could not be loaded.  EZ installation on OEM Harley horn mount - very, VERY loud! A life saver!I have this horn on all my bikes and would not hesitate saying it has saved my life on at very least one occasion but, that's all I needed! It is a must install safety item!

Nice and loud

Inaccurate description, says ooga/dixie horn and neither is accurate, very disappointed with this product, already spent time installing it, don't want to waste more time removing and returning it. Very disappointed

Nice loud horn for compact places. Comes with relay and wiring but no wiring instructions. Just google it. Pretty easy install.

Fun to install