This article explains how to troubleshoot a Kaabo Mantis King GT that will not power on. 

Use this article if your scooter:

• Will not turn on
• Shows no display activity
• Only powers on while connected to the charger
• Powers off immediately
• Has no response when pressing the power button

Before You Start

Please prepare the following:

• Your order number
• A photo/video of the issue
• A photo of the display
• A video showing the scooter attempting to power on
• Confirmation whether:
  • the charger light works
  • the scooter powers on while charging
  • the lights work
  • the motors have resistance when rotated
• Details about whether the issue started after:
  • charging
  • storage
  • transport
  • crash or impact
  • rain or water exposure
  • modification
  • display replacement
  • third-party repair

If there is visible wiring damage, please also prepare clear photos.

Safety Warnings

• Do not continue using the scooter if there is smoke, burning smell, overheating, visible wiring damage, or water exposure.
• Do not work on wiring while the scooter is powered on or connected to the charger.
• Do not allow disconnected motor phase wires to touch each other.
• Do not open sealed battery components.
• Stop and contact support if unsure.

Scooter Will Not Power On

This issue may be caused by:

• Low battery voltage
• Battery faults
• Loose wiring
• Controller faults
• Display faults
• Display switch faults
• Main line wiring faults

Step 1 – Check Whether the Battery Has Charge

Open the battery compartment cover and check whether the battery has voltage using a multimeter. 

Use:

• 200V DC voltage mode
• Red probe on the battery discharge red wire
• Black probe on the battery discharge black wire

If the battery voltage is very low

Charge the scooter fully and test the scooter again.

If the battery has normal voltage

Continue to Step 2.

If you are not comfortable using a multimeter

Stop troubleshooting and contact support.

Step 2 – Check Whether the Scooter Powers On While Charging

Connect the charger and attempt to power the scooter on. 

If the scooter powers on only while charging

The battery may require further inspection.

Please contact support with:

• A video showing the scooter powering on while charging
• A video showing the scooter not powering on after unplugging the charger

If the scooter still does not power on

Continue to Step 3.

Step 3 – Check Battery Output Voltage

Disconnect the battery discharge connection from controller A and controller B. 

Measure the battery output voltage again.

If the battery output is only a few volts or there is no output voltage

Reconnect the charger and check whether the voltage recovers.

If the voltage recovers after charging

Test the scooter again after charging.

If the voltage does not recover

The battery may require further inspection.

Please contact support with:

• Battery voltage readings
• Photos of the battery connections
• A video showing the issue

If the battery voltage appears normal

Continue to Step 4.

Step 4 – Check the SM9 Main Line Connector

Open the battery compartment cover and inspect the SM9 connector between the display main line and controller A. 

Check for:

• Loose wiring
• Incorrect wiring connections
• Unplugged terminals

If loose or incorrect wiring is found

Reconnect the wiring securely and test again.

If the wiring appears normal

Continue to Step 5.

Step 5 – Check Controller Voltage Output

Open the battery compartment cover and use a multimeter to check voltage between:

• The black wire
• The pink wire

on the SM9 connector connected to the controller. 

Normal voltage output should match the battery voltage.

If there is no voltage output

Controller A may require further inspection.

Please contact support with:

• Photos of the connector
• Voltage readings if available
• A video showing the issue

If voltage output is present

Continue to Step 6.

If you are not comfortable using a multimeter

Stop troubleshooting and contact support.

Step 6 – Check for Motor Resistance

Carefully rotate the front and rear motors by hand and check for resistance. 

If a motor has strong resistance

Disconnect the motor phase wires from the controller for the affected motor.

Important Safety Note

Do not allow the three motor phase wires to touch each other. 

Rotate the motor again.

If the resistance disappears after disconnecting the phase wires

The controller for that motor may require further inspection.

Please contact support with:

• A video showing the resistance
• Photos of the controller wiring

If the resistance remains

Further motor inspection may be required.

Please contact support with:

• A video showing the issue
• Photos of the motor wiring

If there is no motor resistance

Continue to Step 7.

Step 7 – Check Controller Continuity

This step requires electrical testing equipment and technical experience. 

Disconnect the controller power connection from the battery.

Using a multimeter in continuity mode:

• Place the black probe on the controller power black wire
• Test continuity between the black wire and the blue, green, and yellow phase wires individually

If continuity exists between the black wire and any phase wire

The controller may require further inspection.

Please contact support with:

• Multimeter continuity results
• Photos of the controller wiring

If no continuity exists

Continue to Step 8.

If you are not comfortable performing continuity testing

Stop troubleshooting and contact support.

Step 8 – Check Whether the Lights Work While the Scooter Is Off

With the scooter still not powering on, press the headlight switch. 

If the lights operate normally

Disconnect the 6-pin waterproof connector between the display and the main line.

If the lights turn off after disconnecting the connector

The display may require further inspection.

Please contact support with:

• A video showing the test
• Photos of the display connector

If the lights stay on

Continue to Step 9.

Step 9 – Check the Display Power Switch Output

Use a multimeter in 200V DC mode. 

Measure:

• Black probe on the black wire terminal
• Red probe on the blue wire terminal

at the connector between the display main line and controller A.

Press and hold the display power button during testing.

If there is no voltage output

The display power switch or display assembly may require further inspection.

Please contact support with:

• A video showing the test
• Photos of the display connector

If voltage output is present

Continue to Step 10.

If you are not comfortable performing voltage testing

Stop troubleshooting and contact support.

Step 10 – Display Main Line Inspection Required

If:

• The battery voltage is normal
• Wiring appears normal
• The controller voltage output appears normal
• The scooter still does not power on

The display main line may require further inspection. 

Please contact support with:

• Photos of all related connectors
• A video showing the issue
• Details of all troubleshooting already completed

When To Contact Support

Please contact support if:

• The scooter still does not power on after these checks
• You are unsure how to complete a step
• There is visible wiring damage
• There was water exposure, crash, impact, modification, or third-party repair
• The scooter has motor resistance
• The scooter overheats, smokes, or has a burning smell
• Internal electrical inspection may be required
• The scooter is unsafe to use

What To Send Support

Please provide:

• Your order number
• A photo/video of the issue
• A photo of the display
• A video showing the scooter attempting to power on
• Charger light behaviour video
• Battery voltage readings if available
• Photos of visible wiring or connector damage
• Confirmation of:
  • water exposure
  • crash or impact
  • modifications
  • display replacement
  • third-party repair
• Details of troubleshooting already completed

Important Safety Notes

• Do not continue using the scooter with unresolved electrical faults.
• Do not ride with motor resistance, overheating, visible wiring damage, smoke, or burning smell.
• Do not open sealed battery components.
• Do not work on wiring while the scooter is powered on or connected to the charger.
• Do not allow disconnected phase wires to touch each other.
• Do not force connectors together.
• Stop troubleshooting and contact support if unsure.