Grandpa Li is a retired worker. He usually likes to drive his electric four-wheeler out for a stroll. He relies on it for grocery shopping and picking up and dropping off his grandson to and from school. This compact and convenient electric four-wheeler has accompanied Grandpa Li through many pleasant moments and has become an indispensable helper in his daily life.

On a rainy day, Grandpa Li drove to pick up his grandson from school as usual. Shortly after leaving home, the rain suddenly became heavier. The raindrops pattered against the car windows, seriously affecting his vision. Grandpa Li quickly turned on the wiper. Strangely enough, the wiper only moved symbolically once and then stopped working completely. This really worried Grandpa Li. Driving without the help of the wiper in such a heavy rain was extremely dangerous.

Grandpa Li carefully pulled over and stopped the car by the roadside. He thought to himself that there must be something wrong with the wiper. He examined the wiper carefully but found no obvious damage in appearance, yet it still wouldn’t work. In desperation, Grandpa Li could only wait until the rain eased up a bit and then slowly drove to a nearby store specializing in electric vehicle repairs.

The repairman warmly received Grandpa Li. First, he listened to Grandpa Li describe the malfunction of the wiper, and then he began to check the vehicle. The repairman turned on the wiper switch and found that there was no sound of the motor turning. He initially judged that it might be a problem with the motor or the circuit. The repairman first checked the wiper circuit and used a multimeter to measure the continuity of each wire. He found that there was no open circuit or short circuit in the wires. Then, the repairman focused his attention on the wiper motor.

The repairman carefully removed the wiper motor. After a thorough inspection, he found that the carbon brushes inside the motor were severely worn, which was very likely the reason why the wiper wasn’t working. The repairman explained to Grandpa Li that the carbon brushes were a crucial part of the motor. As the usage time increased, the carbon brushes would gradually wear out. When the wear reached a certain extent, they couldn’t conduct electricity properly, and the motor would stop working.

The repairman found several wiper motors that were suitable for Grandpa Li’s electric four-wheeler from the store and introduced to Grandpa Li that motors of different brands and models varied in performance, durability, and price. Some motors adopted more advanced technology, ran more smoothly, and made less noise, but they were relatively expensive. While some ordinary motors were more affordable and could also meet the basic daily usage requirements. Considering that his electric four-wheeler was mainly used for short-distance daily trips, Grandpa Li chose a wiper motor with high cost-effectiveness.

After determining the motor, the repairman started the replacement. He skillfully installed the new motor in its original position and then carefully connected the wires, ensuring that every interface was firm and reliable. After the installation was completed, the repairman turned on the wiper switch, and the wiper started working smoothly, swinging from side to side and wiping the rainwater off the car windows clean.

Looking at the newly working wiper, Grandpa Li finally felt at ease. He happily paid the money and drove to pick up his grandson. On the way home, although it was still raining, with the wiper working properly, Grandpa Li drove with the same calmness and peace of mind as before.

This experience made Grandpa Li deeply realize that although the wiper seemed like a small component, it was of vital importance for driving safety on rainy days. He also reminded other owners of electric three-wheelers and four-wheelers to pay more attention to the condition of all vehicle components at ordinary times, regularly check easily worn-out parts such as the wiper, and repair or replace them in a timely manner once any problems were found, so as to make their trips safer and more reassuring. From then on, Grandpa Li would check the wiper before each drive to ensure that it could work properly at critical moments.