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2. Working principle
The pull rod of the rear brake light switch is connected with the brake pedal through the
spring. When the brake pedal is pressed, the brake pull rod moves downward, and the
contact also moves down. It contacts with the two contact shrapnel at the same time.
When the circuit is connected, the brake light is on; When the brake pedal is released,
the brake pull rod moves upward under the elastic force of the return spring, so that the
contact is separated from the two contact shrapnel, the circuit is disconnected, and the
brake light goes out.
3. Basic parameters
The on stroke of the switch is 2.5mm and the full stroke is 6mm.
4. Possible failures
The contact and shrapnel are rusted and in poor contact;
The switch is stuck, and the pull rod cannot move;
Open circuit or short circuit of outgoing line.
Horn
1. Outline drawing
2. Working principle
Working current circuit of horn: positive lug → horn coil → contact → negative lug. After
the current passes through the horn coil, the magnetic field generates suction on the
armature, which makes the bass diaphragm and the treble diaphragm move at the same
time. When the contact is opened, the current is interrupted, and the electromagnetic
force disappears. The diaphragm returns by its own elastic force, the contact is closed
again, and the circuit is connected again. The contact clearance can be adjusted by
screw to change the vibration frequency of diaphragm, so as to change the sound level.
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