Also wanna make sure the horn bracket is not stopping the horn "speaker" from vibrating. I only got a single "beep" when I connected directly until I noticed the bracket was pushing up against the horn grill and was not allowing the horn to vibrate.
Check the connector to the horn. Ensure no corrosion...if it looks good...you can this...
Yamaha horns usually have 2 wires...a hot wire (pink) to the horn and a black wire returing to the the horn button...the button grounds the circuit to sound the horn.
You can also jumper the horn black directly to ground and turn on the key...if horn is loud now....you have poor connection in your horn button wiring or ground.
If it makes no difference jumpering and horn is not wet inside....probably the horn is bad. Some have an adjustment nut in the center that can be adjusted to alter tone somewhat....worth trying before tossing horn.
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