What Are the Reasons for an Electric Quadricycle Having Power but Unable to Move?
3 Answers
Electric quadricycle has power but cannot move, the reasons are as follows: Battery output failure: If the output is too low, it indicates that the battery is damaged and needs to be replaced. Handle brake wire breakage: If the vehicle rotates, it proves that the brake handle is broken and must be replaced. Check the throttle: Use a wire to short-circuit the positive pole and signal line of the throttle. If the vehicle moves, it indicates that the throttle is broken and needs to be replaced or repaired. Turn on the power and twist the throttle, then use a multimeter to measure the positive pole line and signal line. Controller damage: You can short-circuit the positive 5V of the throttle line. If the throttle rotates, it means the controller is fine. The simplest way is to smell if the controller has a burnt smell. If it does, it proves the controller is damaged and needs to be replaced. Motor damage: Loose contact of the motor carbon brushes can also cause the vehicle to have power but not move. It is recommended to go to a repair shop for maintenance or replacement.
That morning I had just loaded the parcels onto the car, turned the key to show a full battery but it wouldn't move no matter what, making me sweat with anxiety. Later, the mechanic said the controller was burnt out—this thing is essentially the brain of an electric vehicle, responsible for controlling the current's on-off state. Sometimes loose wiring connections or rodent-chewed wires can cause this too, especially in models with lower ground clearance. A seized front wheel brake is another common reason; try pushing the car to see if the wheels can rotate. The problem is more likely to occur after wading through water on rainy days, as water short-circuits the electronic components, triggering automatic power-off protection. Never repeatedly twist the throttle to force it; last year, a neighbor completely burnt out their controller and had to spend an extra 800 bucks on a replacement.
I've been repairing electric vehicles for over a decade. In this situation, first check if the dashboard shows inaccurate battery level. The safest way is to measure the actual battery voltage with a multimeter - sometimes a single battery group disconnection can paralyze the entire pack. Focus on inspecting the three-phase wires from the controller output to the motor, tighten the connection bolts with a wrench as oxidation and rust increase resistance. I remember last year there was a go-kart whose owner installed an audio system causing the ECU to receive wrong signals and shut down. Most four-wheelers nowadays have brake priority systems - even slight brake pedal sticking will cut power transmission. Try firmly pressing the brake pedal twice to reset it.
