What Causes a Car Horn to Work Intermittently?
1 Answers
Car horn working intermittently may be caused by poor sealing, poor contact of the electromagnetic coil terminals, and contact point erosion. The following are detailed explanations: 1. Poor sealing leading to moisture: Although the horn is internally sealed, if the sealing is not tight, moisture may enter during car washing or water vapor may be present in the internal air space, which can easily cause the contacts to become damp and fail to function properly. 2. Poor contact of electromagnetic coil terminals: Some horns have aluminum metal rivet crimped connections for the enameled wire terminals of the internal electromagnetic coil. If the insulation paint on the enameled wire ends is not properly treated or the rivet crimping is not secure, it can lead to intermittent contact, causing the horn to malfunction. This issue is due to the horn's quality and cannot be repaired; it requires replacement. 3. Contact point erosion: Prolonged pressing of the horn can cause the contacts to erode, creating resistance. This reduces the electromagnetic attraction, preventing the armature from driving the diaphragm to vibrate normally, resulting in a hoarse sound or even no sound at all. However, when the horn is pressed continuously, a momentary strong current passing through the resistance may allow it to work intermittently, functioning sometimes and failing at other times.
