Truck horn is a device frequently used when driving. If the horn fails, it will be very inconvenient to drive. Sometimes the horn is trumpet, and the sound is not like a mosquito, it is very husky, even without a sound. What is the cause of this?

Let's see how the horn works. When the horn button on the steering wheel or other position is pressed, the current from the Baotou North running heavy card accessories battery will flow through the loop to the electromagnetic coil of the horn relay. The electromagnetic coil draws the movable contact switch of the relay to close, and the current will flow to the horn. The current makes the electromagnet of the loudspeaker work, so that the vibrating membrane vibrate and make the sound.

According to the author's experience, in many faults related to loudspeakers, the problem of speakers is often the failure of speakers themselves. In particular, there are some defects in the location of loudspeaker installed on some cars. When raining, it is easy to wet the loudspeaker, causing the damage of speakers. When the horn does not sound, the common fault location is not more than 3 points, that is, the horn itself, the horn switch contact and the horn harness. When the failure occurs, it can be checked by the following steps.

(1) sometimes it does not sound: according to the horn switch, if the horn is sometimes ringing, sometimes it doesn't sound, the contact contact inside the horn switch is not good, and some are also the problem of the horn itself.

(2) hoarse voice: mostly due to poor contact of the plug, especially the various contacts around the steering wheel. Because of frequent use, it easily causes contact wear.

(3) not at all. First, check the fuse to see if it is blown. Then pull the horn plug and use multimeter to measure whether there is electricity in the horn switch. If there is no electricity, check Baotou North run heavy card accessories horn wire harness and horn relay; if electricity, it is the problem of the horn itself, at this time can also try to adjust the adjustment nut on the horn to see if it can sound, if still not sound, you need to replace the Baotou North run heavy card accessories horn.