I have a power wheels ATV dune that has a charged battery but has no power still. What other issue can i check?

Question edited for clarity.
Question edited to English.
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Failing battery or faulty trickle charger or onboard charging system depending where the loss is. Your question loses detail in translation. See if you can find a Dutch forum.

https://www.google.com/search?q=Dutch+polaris+ATV+forum

Loss of power

https://www.google.com/search?q=polaris+sportsman+90+no+power

..

If your HS400ATV is not powering up even with a fully charged battery and you've already replaced the ignition switch, there may indeed be another module or component that could be causing the issue. Here are a few possibilities to consider:
1. Main Fuse: Check the main fuse for the ATV. It is typically located near the battery or within the fuse box. Ensure that the fuse is not blown and is making proper contact. A blown main fuse can prevent power from reaching the ignition switch and other electrical components.
2. Starter Solenoid: The starter solenoid is responsible for engaging the starter motor when you turn the ignition key. If the solenoid is faulty or not functioning correctly, it can prevent the ATV from powering up. Inspect the solenoid for any signs of damage or loose connections. Consider testing the solenoid or replacing it if necessary.
3. Kill Switch/Safety Interlock: Check if there is a kill switch or safety interlock feature on your ATV. These safety mechanisms are designed to prevent the ATV from starting under certain conditions, such as when the brakes are not engaged or if the ATV is not in neutral. Make sure these switches are in the correct position and functioning properly.
4. Wiring and Connectors: Inspect the wiring harness and connectors for any loose, damaged, or corroded connections. Pay close attention to the connections between the battery, ignition switch, and any other modules or components. Clean and tighten any loose connections, and repair or replace any damaged wiring or connectors.
5. Electronic Control Module (ECM): The ECM or other control modules could be a potential source of the issue. These modules control various electrical functions in the ATV. However, diagnosing and testing these modules often requires specialized tools and knowledge. It may be best to consult a professional ATV mechanic or an authorized dealer who can properly diagnose and test the modules if needed.
If you've checked these possibilities and the issue still persists, it is recommended to seek professional assistance. They will have the expertise and equipment necessary to diagnose and resolve electrical issues specific to your HS400ATV.

Sketer, check all fuses, could be the stator..also the regulator/rectifier faulty. Google search your make and model# manual.Check the attached links,instruction and guides, Good luck
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Check the gear linkage levers are not worn or bent. Next step is to disconnect gear linkage and try to select rev by moving the lever at the gearbox itself. Next is to strip the gearbox and find the broken part.

ATV stands for All Terrain Vehicle. It is a type of vehicle that is used on terrains that are uncommon for regular vehicles to be used on. Such terrains include steep mountain trails and sand dunes.

Are the cables hooked to the right terminals and not backwards?

get a new one

try investing in a battery charger instead of replacing the battery the dune buggy probably doesn't have an altinater to recharge the battery

it probably is the interlock switch/ the black square with 2 small green wires and to large reds.replace that and should run.just bypassed mine and know it works.have fun