Why Won't the Car Wiper Stop?
3 Answers
Here are the reasons why the car wiper won't stop: 1. The wiper keeps running continuously, which may be a wiring issue; 2. It could be due to a damaged combination switch; 3. There might be a break in the wiring that causes the wiper's negative terminal to connect with the car body. Additional information: 1. The power source of the wiper comes from the motor, which is the core of the entire wiper system. The quality requirements for the wiper motor are very high. It uses a DC permanent magnet motor, and the wiper motor installed on the front windshield is usually integrated with the worm gear mechanical part. 2. The worm gear mechanism serves to reduce speed and increase torque. Its output shaft drives a four-bar linkage mechanism, which converts continuous rotational motion into a left-right oscillating motion. The working principle of the wiper circuit is different from other electrical circuits. Other electrical appliances turn off the positive terminal (commonly known as the live wire).
I've encountered a similar issue before when my wipers wouldn't stop wiping. After checking, I found the wiper switch was stuck, probably due to internal wear or moisture ingress keeping it constantly powered. Another common culprit is a faulty relay - that component controls circuit switching, and if it gets stuck, the wipers won't stop. Wiring shorts are also possible, especially if the wires near the wiper motor have aged and exposed insulation. I'd suggest first trying to temporarily cut power by pulling the fuse, but make sure to do this in a safe location. If that doesn't work, check if the battery voltage is abnormally high, as excessive voltage can damage the motor controller. Driving with non-stop wipers in rain is extremely dangerous due to impaired visibility - I once had to tape the wiper arms in place just to make it to the repair shop. For maintenance, I recommend regular cleaning of the wiper system and avoiding prolonged use in humid conditions. These minor faults can accumulate into more serious accidents, so don't delay repairs.
I find that non-stop wipers are usually related to electrical circuits, especially the wiper motor or controller. If there's a short circuit inside the motor, it will keep running, and if the control box is damaged, the signals get messed up. Also, the relay, which is responsible for switching the current, can cause the circuit to stay continuously on if it's burnt or stuck. In terms of wiring, loose or corroded connections might trigger continuous operation on bumpy roads. When dealing with such issues, my first move is to turn off the car to prevent draining the battery or causing sparks. If you're doing it yourself, check the fuse—its location is marked in the manual near the driver's seat—and pulling it out can cut the power. Remember to clean the wiper connections during regular maintenance to avoid debris buildup. An abnormal voltage regulator can also cause wiper malfunctions, so it's best to have a professional measure the system voltage. Don't overlook this, as erratic wiper movement might damage the windshield or cause accidents.
