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How do i install a new louder horn for my scooter? i have a bosch 30amp relay, a switch and the electronic horn.

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First you will have to determine if your horn activates by earthing via the horn button or by connecting to positive via the horn button.
Locate the old horn and remove its wires. Connect these wires to the relay on pins 85 and 86. Operate the horn button and the relay should click.
Run a new wire from battery positive to relay pin 30.
Run a new wire from pin 87 to the horn positive.
Run a new wire from horn negative to an earthing point close to the horn or to battery negative and you're done.

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Posted on Dec 29, 2010


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Principles of Operation
When the horn switch is depressed, a message is sent from the instrument cluster via the network communication link to the front electronic module (FEM). The FEM acknowledges the message and energizes the horn relay by grounding the horn relay coil which allows the dual note horn to sound.
Inspection and Verification
NOTE: The FEM and instrument cluster must be reconfigured upon replacement. Refer to Section 418-01 .
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  1. Visually inspect for obvious signs of mechanical and electrical damage.
Visual Inspection Chart

  • Damaged horn
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      • 422 (20A)
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      • 213 (5A)
      • 217 (5A)
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    • check the connections to the vehicle.
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