why the whole electric vehicles has no power?

1 electric vehicles has no power The fuse is broken. Use a multimeter to measure the battery terminal voltage. If there is voltage output, it is normal. If there is no voltage output, the fuse is broken or the battery plug is broken

Or the battery is broken.

2. electric vehicles has no power The wiring plug is loose. Check the power switch connector.

3. If the electric vehicles has no power power switch is broken, use a multimeter to measure the voltage at both ends of the input and output lines of the power switch. If there is normal voltage output, the power switch is normal If there is no voltage output, the power switch is broken [when the battery has voltage output], it shall be repaired or replaced

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