What Causes a Car Horn to Work Intermittently?

[HectorLee]

The reasons for a car horn working intermittently include internal moisture in the horn and poor contact at the electromagnetic coil terminals. The specific causes and solutions are as follows: Internal Moisture in the Horn: If the horn is not tightly sealed, moisture may enter during car washing, or water vapor may be present in the internal space. This moisture can easily cause the contacts to become damp and fail to function properly. The solution is to place the horn in a dry, well-ventilated area to allow it to air dry naturally. Poor Contact at the Electromagnetic Coil Terminals: Some horns have electromagnetic coil terminals connected with aluminum metal rivets instead of secure soldering. If the insulation paint on the enameled wire ends is not properly removed or the rivets are not tightly crimped, it can lead to poor contact and cause the horn to malfunction. The solution is to replace the faulty components.