Why Doesn't the Car Horn Work?
1 Answers
Horn malfunctions can be attributed to the following reasons: 1. Contact Erosion: Prolonged use of the horn can lead to contact erosion and impedance buildup. This reduces the current passing through the electromagnetic coil, weakening the electromagnetic force. As a result, the armature fails to properly vibrate the diaphragm, causing the horn to sound hoarse or stop working altogether. However, intermittent strong currents might temporarily restore normal function, leading to inconsistent performance. 2. Poor Sealing Leading to Moisture: Although the horn is internally sealed, improper sealing can allow moisture or steam to enter during car washes. This moisture can cause the contacts to dampen and malfunction. 3. Poor Connection at Electromagnetic Coil Terminals: Some horns have aluminum rivet connections for the enameled wire terminals of the electromagnetic coil inside. If the insulation varnish on the wire ends isn't properly removed or the rivet connections are loose, it can lead to operational issues. Such faults are typically due to manufacturing defects and cannot be repaired, necessitating replacement.