26MR31M
Horn Button
Mack

The horn button provides a weather-resistant, momentary switch for horn activation with reliable electrical contact under vibration and temperature variation typical of heavy-duty use. Its design emphasizes tactile feedback and durable housing to prevent moisture ingress and corrosion of internal contacts. Properly connected to the vehicle’s horn circuit, this component ensures immediate signaling capability for driver safety in traffic or emergency situations. Installation requires securing the switch in its bezel, ensuring a clean electrical connection, and verifying continuity with a test function. When replacing, attention to terminal polarity and gasket integrity helps maintain environmental protection and long-term performance. Source One Parts Center.