What causes a car horn to stop working?
1 Answers
The reasons for a car horn not working include the following: 1. Poor sealing leading to moisture: The interior of the horn is sealed, and if the sealing is not tight, moisture may enter during car washing or water vapor may be present in the internal space, which can easily cause the contacts to become damp and fail to function properly. 2. Poor contact at the electromagnetic coil terminals: Some horns have aluminum metal rivets crimped to connect the enameled wire terminals of the internal electromagnetic coils, rather than being securely welded. If the insulation paint on the ends of the enameled wire is not properly removed or the rivets are not crimped tightly, it can easily lead to intermittent contact faults, resulting in poor horn performance. This type of fault is due to the quality of the horn and cannot be repaired; only replacement with a new part is possible. 3. Contact erosion: Prolonged pressing of the horn can cause the contacts to erode, creating impedance. This reduces the current flowing through the electromagnetic coil, weakening the electromagnetic force and preventing it from attracting the armature to drive the diaphragm to vibrate normally, resulting in a hoarse sound or even no sound at all. However, when the horn is pressed repeatedly, a momentary strong current passing through the impedance can still allow it to work normally, leading to intermittent functionality.
