Problem Description
The vehicle is unable to operate normally and will not start.
User Self-Diagnosis: Causes and Solutions
Battery Depleted
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Charge or replace the battery.
Check the motor and repair or replace faulty components.
If none of the above methods resolve the issue, it is recommended to contact a professional for maintenance.
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Motor Malfunction
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Customer Support
If you still have questions, please contact GKB Customer Service service_aftersale@geekbuying.com.
For Engineers
Solutions
- Inspection
Power Switch
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Make sure the key switch or power switch is in the “on” position. Ensure the power switch is turned on.
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Check the Fuse or Circuit Breaker
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If the scooter uses a fuse, inspect the fuse to see if it is blown. You may need to remove the fuse from the scooter and hold it up to a light source to determine if it is blown.
For scooters with a circuit breaker, push or flip the circuit breaker to see if it will reset.
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Push Start the Scooter
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Confirm if the dashboard is set to zero-start or non-zero-start and observe if the brake light and dashboard brake indicator illuminate, or you can disconnect the kill switches on the left and right brake handles to troubleshoot.
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Charge for 8 Horas
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A battery pack for an electric scooter that has not been charged for over a month may be partially discharged and may not provide enough power to run the scooter. Try charging the battery pack for 8 horas, and then see if it helps.
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Visual, Tactile, and Olfactory Inspection
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Remove the pedal or wiring cover and look for any burned or melted wires, wire connectors, or electrical components.
Also look for loose, desconectado, or damaged wires or wire connectors. Pull and push all individual wires and wire connectors to ensure they are not loose or disconnected.
Get close to the speed controller and motor and smell them. Any parts that look burned or melted, or smell like burned plastic, are almost always defective and should be replaced to prevent damage to the speed controller.
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- Pruebas
Test Voltage at the Power Connector
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Test the voltage at the power connector that plugs into the controller. This is usually a connector with thick red and black wires.
Most vehicles will have voltage at this connector whether the power or key switch is on or off, but some vehicles require the power or key switch to be on to have voltage at this connector. Perform this test with the power or key switch on.
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Test the Fuse or Circuit Breaker
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If the throttle has an indicator light that turns on and off via the key switch or power switch, the fuse or circuit breaker is working.
Sometimes fuses blow in places you can’t see, and sometimes circuit breakers mechanically reset but are worn and still don’t work. Checking the continuity of the fuse or circuit breaker with a multimeter is the best way to determine if they are working.
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Test the Brake Lever Switch
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The brake lever switch tells the speed controller to shut off the motor when braking.
Most scooters have normally open brake switches, but some scooters have normally closed brake switches.
To test a normally open brake switch for failure, disconnect the brake lever wire connector from the speed controller, and see if the scooter runs. If the scooter runs with the brake lever switch disconnected from the speed controller, then the brake lever switch is normally open and faulty.
To test a normally closed brake lever switch for failure, disconnect the brake lever wire connector from the speed controller and bridge the two terminals in the disconnected controller connector. If the scooter runs when the controller’s brake switch connector terminals are bridged together, then the brake switch is normally closed and faulty.
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Test the Key Switch or Power Switch
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If the throttle has an indicator light that turns on and off via the key switch or power switch, it indicates that the key switch or power switch is working. Test its mechanical operation by moving the key switch or power switch from the off position to the on position several times. The switch should snap into two positions. If the switch feels loose or there isn’t a clear click when switching between the on and off positions, the switch may be defective.
Sometimes, the key switch or power switch feels fine and has a positive quick action when switching between the on and off positions, but it is still defective. Testing the continuity of the key switch or power switch with a multimeter is the best way to determine if it is working.
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If the battery charger is plugged into the wall, unplug it. Plug the battery charger into the battery charger port on the vehicle and check if there is an illuminated indicator light on the battery charger. If the indicator light on the battery charger lights up, this means the wiring and wire connectors connected to the charger port are good, and the charger port itself is also good. Not all battery chargers have an indicator light that illuminates when the charger is only plugged into the vehicle, so if the light does not come on, you should perform a secondary voltage test with a multimeter as described below.
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Testing the Battery Charger
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Testing the Battery Pack
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Remove the battery pack from the scooter and take out individual batteries to load-test their cells.
You can then test each battery using an automotive battery load tester.
Most entry-level automotive battery load testers apply a 100-amp load to the battery, which is too high, so a variable carbon pile battery load tester should be used and adjusted to apply a 30-amp load to the battery.
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Testing the Battery Pack Voltage
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After reading the voltage, you can use the battery charge state chart page to determine the percentage of the charge state.
A good battery or battery pack will be at 100% charge state after being discharged and left for a few minutes, or if stored. If the battery pack does not rebound to a 100% charge state within a few minutes after being discharged, it indicates the battery or battery pack is faulty or worn.
When a battery pack has been charged to a 100% charge state and its voltage drops below 100% charge state after being left for some time, this indicates the battery pack is faulty or worn.
Good batteries and battery packs will recover to a 100% charge state within a few minutes after the vehicle has been driven.
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- Inspection
Speed Controller
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Look for any burned or melted wires or wire connectors on the speed controller. If any wires are burned or melted, the speed controller may be faulty.
Smell the speed controller for any burnt plastic odor. If the speed controller smells burnt, it is almost always defective.
If the speed controller does not have burned or melted wires and there is no burnt smell, it may still be defective. Test all other parts of the electrical system around the speed controller and use the process of elimination to detect if the speed controller is working.
The speed controller is too complex to easily test. Using an inspection and elimination process is the best method to determine if the speed controller is working. If all other components in the electrical system test well but the scooter does not run, it indicates that the speed controller is defective.
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Inspecting the Motor
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Look for any burned or melted wires or wire connectors on the motor. Burned or melted wires or wire connectors indicate the motor overheated, which could cause the plastic insulation to melt off the copper windings of the motor.
Smell the motor for any burnt plastic odor. If the motor smells burnt, it indicates the windings overheated. Motors with overheated windings should always be replaced to prevent damage to the speed controller.
If the insulation on the copper windings melts, it will cause a short circuit and result in the motor not running or running slowly. Short-circuited motor windings can also burn out the speed controller by providing excessive resistance, causing it to work too hard and overheat.
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