What causes no power when turning on the car ignition?
3 Answers
It is usually caused by loose or broken battery terminal wires, or a faulty power relay, resulting in no power when turning the key. Below is an introduction to automobiles: 1. Definition: According to China's latest national standard "Terms and Definitions of Motor Vehicles and Trailers" (GB/T3730.1-2001), a motor vehicle is defined as a non-track vehicle with 4 or more wheels, powered by an engine. 2. Purpose: Mainly used for transporting people and/or goods; towing vehicles for transporting people and/or goods, and for special purposes. 3. Development: Starting from July 1, 2018, China reduced import tariffs on complete vehicles and auto parts.
When the car doesn't respond after turning the ignition, I usually suspect a battery issue first. After all, the battery is the most common failure point, as its lifespan expiration or cold weather can cause a sudden voltage drop. Use a multimeter to measure the voltage at both ends of the battery; if it's below 12 volts, it's likely insufficient power, and charging or replacing the battery can solve the problem. Next, check if the battery terminals are loose or corroded—tighten them if loose, and clean them with sandpaper if corroded. If that doesn't work, inspect the ignition fuse in the fuse box; replace it if it's blown. Sometimes, the starter relay is faulty, located in the engine compartment—pull it out and check if the contacts are burnt or blackened. During regular maintenance, I pay attention to cleaning connection points to prevent issues. If you find no power, stop immediately and avoid repeated attempts to prevent damaging components. If you can't handle it, seek help from a repair shop—safety comes first.
As a long-time driver, when the car won't start due to electrical issues, I believe we should start with the power system. First, perform a simple test: if the dashboard lights don't come on or appear very dim when attempting to start, it's likely a dead battery or corroded terminals. Try jump-starting the car using another vehicle's battery to see if the situation improves. Then check the fuses, especially those related to the ignition circuit - a blown fuse can be easily replaced. If the battery is fine but there's still no response, the relay or starter might be faulty. These components are easy to locate but require professional tools for replacement. Don't forget to check for dust accumulation in the keyhole - sometimes small issues can cause big problems. It's advisable to avoid keeping electrical systems on for extended periods when the engine is off, pay attention to battery condition during maintenance, and seek professional help promptly when encountering issues rather than struggling through them.
