Review on 125Db Loud Electric Horn For Trucks, Cars, And Motorcycles - Red SoundOriginal 12Volt Air Horn With Automotive Relay by Andre Parsons

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.