Why does the car horn sometimes work and sometimes not?

[DelPaisley]

The reasons why the car horn sometimes works and sometimes not are as follows: 1. Poor sealing leading to moisture: Although the horn is internally sealed, if the sealing is not tight, fog may enter during car washing or there may be water vapor in the internal air space. This moisture can easily cause the contacts to get damp and fail to function properly. 2. Poor contact at the electromagnetic coil terminals: In some horns, the enameled wire terminal connections of the internal electromagnetic coil are made with aluminum metal rivets for crimping, rather than secure soldering. If the insulation varnish on the wire ends is not properly treated or the rivets are not crimped tightly, it can easily lead to intermittent contact faults, resulting in poor horn operation. This type of fault is due to the quality of the horn and cannot be repaired; only replacement with a new part is possible.