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Garage / Re: Horn works intermittently on 72 twin cam
« Last post by jbcollier on Today at 03:47:20 PM »The horn is an electrical solenoid attached to a diaphragm and points. When you complete the circuit with the horn button, power flows through the solenoid’s windings. This moves the diaphragm and opens the points. The open points collapse the windings, the diaphragm moves back and the points close. This repeats rapidly creating the horn’s “honk”.
The adjustment screw controls the amount of spring pressure holding the points closed. Less tension gives a higher tone (faster on/off cycles) and more a lower tone. It only works within a narrow range. In the old days you set it up by adjusting the amp draw but those days are long gone.
You can take the horn apart and clean the points. Just mark everything so you get it all back together correctly. Then adjust for the tone you want.
The adjustment screw controls the amount of spring pressure holding the points closed. Less tension gives a higher tone (faster on/off cycles) and more a lower tone. It only works within a narrow range. In the old days you set it up by adjusting the amp draw but those days are long gone.
You can take the horn apart and clean the points. Just mark everything so you get it all back together correctly. Then adjust for the tone you want.