Troubleshooting an E-Bike: Why Wont it Turn On?

There are various typical reasons why an electric bike might not be turning on, regardless of whether you’ve had one for a while or recently got your first one.

In this article, we’ll take a closer look at why your electric bike isn’t starting up and provide tips to troubleshoot and get it running again. From checking the battery connections to resetting the controller, we’ll cover all the potential issues that could be preventing your e-bike from turning on.

1 Troubleshooting an E-bike: Why Won’t It Turn on

There are a number of possible reasons why your e-bike won’t turn on, and you should look into them all. Make sure the battery is charged first and foremost.

If it isn’t, plug in the charger and allow it to charge for at least an hour before attempting to power up the bike again. Additionally, check all connections from the battery to the motor, ensuring that everything is properly connected and secure.

It’s also important to check any fuses or circuit breakers located in the electric drive system. A tripped fuse or breaker could be causing your bike not to turn on.

You may need to inspect more closely at other electrical system parts, such as the throttle cable or wire harnesses, if trying these methods doesn’t get your e-bike operating again.

Make sure they are securely attached and free of any corrosion or damage which could prevent them from working properly. You may also need to inspect any switches or control systems that are part of your e-bike’s electric drive system; if one of these components has failed or been damaged it can prevent your bike from turning on correctly.

1.1 Check the power supply

The power source should always be checked first when troubleshooting an e-bike. Bike won’t start if battery is dead. Connect a charger to the device to see if any lights turn on to confirm this. There may be indications on your electric bike that let you know when charging is underway or when it has finished, depending on the model.

Additionally, make sure all wires are connected properly. Look for signs of corrosion or damage and ensure that all connections are tight and secure. If there appears to be no power coming from the battery or charger, then you may need to replace them completely in order for your e-bike to work again.

1.2 Check the battery

When troubleshooting an E-bike, one of the first things to look at is the battery. A dead battery can prevent your bike from turning on. To determine if this is the issue, you should check that all connections are secure and in good condition. If they appear worn or corroded, it may be necessary to replace them.

Additionally, make sure that any charging cables are properly connected and that the charger itself is functioning correctly. You should also ensure that your battery is fully charged before attempting to turn on your E-bike. If after inspecting these components you still cannot get your E-bike to turn on, then it may be a sign of a more serious issue such as an electrical malfunction or motor failure.

1.3 Check the connections

Both the on/off switch and the connections between the battery and the e-bike controller need to be examined. Verify that each of these connections is strong and set up correctly.

If any of them appear loose or disconnected, tighten or reconnect them accordingly. Additionally, it is a good idea to check for corrosion or other signs of damage on the battery terminals.

Before attempting to restart your e-bike, gently remove any corrosion with a wire brush if it is present. You should have no trouble starting your e-bike after checking and securing all the connections.

1.4 Check the fuses

When diagnosing issues with an e-bike, one of the first steps is to check the fuses. Fuses are designed to protect against short circuits and other electrical faults that can prevent an e-bike from functioning properly.

If a fuse has blown, it will need to be replaced before the e-bike can be used safely and reliably. To do this, locate the fuse box on your e-bike and remove any faulty fuses, then replace them with new ones that match the original type and rating.

Make sure all connections are secure before you turn on your e-bike again. If replacing the fuses does not resolve the issue, further troubleshooting may be required in order to identify why your e-bike won’t turn on.

1.5 Troubleshoot the motor

Checking the motor is the first step in diagnosing an e-bike. Your e-bike could be unable to start or perform as intended if the motor is broken. Start by checking the connections between the battery and the motor for any loose wires or connectors. If everything looks good, try cycling through all of the settings on your bike’s control panel to ensure that it is set up correctly.

If you’re still having trouble getting your e-bike to turn on, remove and inspect each part of the motor for signs of damage or wear and tear.

Check for frayed wires, corrosion, or loose parts that may be preventing your bike from turning on. Once you have identified any potential problems with the motor itself, you can then begin replacing any necessary components so that your e-bike will function properly again.

2 Troubleshooting the Motor

Troubleshooting the motor of an e-bike is a critical process for ensuring that the bike is operating properly. The first step in troubleshooting the motor is to check all connections and wiring for continuity.

This includes checking all fuses, connectors, and wires for any damage or wear. If there are any loose connections or frayed wires, they should be replaced immediately.

Additionally, it’s important to make sure that all battery terminals are clean and free from corrosion before proceeding with further tests.

The next step in troubleshooting the motor is to test its functionality by powering up the bike. To do this safely, it’s best to use a multimeter set to DC volts (volts direct current).

Connect one lead of the meter to each terminal of the battery pack while monitoring voltage levels on the display screen. If readings are below 8 volts then it may indicate a dead battery or another electrical issue that will need further investigation.

After testing voltage levels at rest, you can then move on to testing power output when pedaling by connecting a wattmeter between the motor controller and battery pack while riding your e-bike.

2.1 Check the motor voltage

The voltage supplied to the motor determines how much power it will receive and ultimately how well it will operate. If the voltage is too low, then the motor may not be able to generate enough power to perform its task.

Conversely, if the voltage is too high, then there could be damage done to either the motor or other components connected to it. To check for proper voltage levels, use a multimeter set at AC volts and connect it between two terminals on your motor’s control circuit board.

Once connected, read off what value appears on the screen and compare this with what your manual states as being an acceptable range of voltages for your particular model of the motor. If anything falls outside of these specifications then further investigation needs to be done in order to determine why this discrepancy exists and whether or not corrective action needs to be taken before using this device again.

2.2 Check for obstructions

One of the first stages in troubleshooting a motor is to look for any obstacles. Make sure nothing is obstructing or hindering the motor’s ability to function normally.

This can include anything from debris on the outside of the motor, to dirt and dust building up inside. If something is blocking or otherwise interfering with the components of your motor, it will be necessary to remove these obstacles in order for the motor to run properly.

In addition, it can also be helpful to check for any loose connections within your motor’s wiring system. Loose wires can cause electrical shorts and other malfunctions that could prevent your motor from running correctly.

Ensuring that all connections are secure and properly connected can help you get back on track in no time! Finally, if you suspect an obstruction but cannot find anything obvious then checking for corrosion may be necessary.

Corrosion can occur when metal parts come into contact with moisture or other environmental factors such as salt water or extreme temperatures over time. If present, this corrosion should be removed before attempting further repairs as it could interfere with the normal functioning of your motor and lead to further damage down the road.

2.3 Check the motor control system

Troubleshooting can be a tricky and complex process. To start, check all the electrical connections between the motor and its controller.

Make sure all wires are properly connected, secured, and not showing any signs of wear or damage. Additionally, inspect the fuse box for any blown fuses that may cause an issue with connecting power to the motor.

Next, check for corrosion or rust on the terminals of both the motor and controller. If there is corrosion present, clean them using a wire brush or other suitable tool to ensure proper connection between components.

Afterward, test your system’s voltage output level by using a multimeter set to AC volts mode (or DC depending on your application).

The voltage should read within 10% of its rated value as indicated in your product manual. If it reads too low or too high you will need to adjust either the input voltage or frequency accordingly until you reach your desired output level.

Finally, if necessary you can use an oscilloscope to observe signal waveforms from different points in your circuit such as between two components or at various locations along a single wire harness. This can help identify any issues with signal integrity that could lead to poor performance from your motor control system.

2.4 Check the motor controller

When dealing with motor issues, the motor controller is an important part of the equation. It is responsible for controlling how much power is sent to the motor, so it’s essential that it functions properly for the motor to work correctly.

If a problem occurs with the motor or its operation, checking the controller should be one of the first steps in troubleshooting. To check if there is something wrong with your controller, you’ll need access to a multimeter and some basic knowledge of electrical systems.

Begin by unplugging all connections from both ends of your controller and then use your multimeter to take voltage readings at both ends.

Make sure that each end has a steady 12-volt reading when connected directly to a battery source. If either end shows no voltage or doesn’t hold steady while connected, then it could indicate an issue with your controller. If you find any problems during this process, you should seek help from an electrician or other qualified professional who can determine whether repairs are needed or if replacing the entire controller may be necessary.

2.5 Test the throttle

In order to troubleshoot the motor, it is important to check the throttle. The throttle is a key component of any motor and must be working correctly in order for the motor to run properly.

To test the throttle, first ensure that all connections are secure and there are no loose wires or parts. Then, turn on the power switch and adjust the throttle lever so that it is in its lowest position.

Next, slowly increase the speed of the throttle lever until you reach maximum speed. If everything appears normal, then your throttle should be fine. However, if you hear strange noises coming from your motor or feel any resistance when increasing or decreasing speed then you may need to replace your throttle with a new one.


Corrosion can occur when metal parts come into contact with moisture or other environmental factors such as salt water or extreme temperatures over time.

If you find any problems during this process, you should seek help from an electrician or other qualified professional who can determine whether repairs are needed or if replacing the entire controller may be necessary.