Trailer Lamp suddenly goes out, what causes it?

There may be many reasons why the trailer lamp suddenly goes out. Here are some common reasons:
Circuit problem:
The circuit of the trailer lamp may be broken or short-circuited, causing the current to not flow properly, thus turning the lamp off.
The plug, terminal or wire connection may be loose or damaged, affecting the integrity of the circuit.
Bulb failure:
The bulb itself may be damaged or burned out and needs to be replaced with a new bulb.
The bulb may also suddenly go out due to the expiration of its life or overcurrent shock.
Fuse blown:
The fuse of the trailer lamp may be blown due to overload or short circuit, causing the circuit to be disconnected and the lamp to not work properly.
Switch failure:
There may be a problem with the switch of the trailer lamp, such as poor contact, damage or internal fault of the switch, resulting in the inability to properly control the switch state of the lamp.
Unstable voltage:
If the voltage of the vehicle or power supply to which the trailer is connected is unstable, it may cause the voltage of the trailer lamp to fluctuate, causing it to go out.
Environmental influences:
Harsh weather conditions (such as heavy rain, snow, strong winds, etc.) may damage or affect the circuit or bulb of the trailer light.
Dust, mud or other dirt may accumulate around the bulb or circuit, affecting the normal operation of the circuit.
Other causes:
The trailer light's relay or other electronic components may be faulty, causing the light to not work properly.
The trailer light's lamp holder or fixture may be loose or damaged, causing the bulb to not be installed or fixed properly.
For the above possible causes, the following are some recommended solutions:
Check whether the circuit connection is firm. If it is loose or damaged, repair or replace it in time.
Replace damaged bulbs and ensure that they meet the specifications.
Check whether the fuse is blown and replace it if necessary.
Check whether the switch is working properly and repair or replace it if it is faulty.
Make sure the voltage of the vehicle or power supply to which the trailer is connected is stable and take appropriate measures to adjust it if necessary.
Regularly clean the area around the trailer light bulb and circuit to ensure that there is no accumulation of dust, mud or other dirt.
Seek the help of professional maintenance personnel for diagnosis and repair if necessary.