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Electric Scooter Troubleshooting Guide

Electric Scooter Troubleshooting Guide > Speed Controller Clicks But Vehicle Does Not Move

Speed Controller Clicks But Vehicle Does Not Move

 

Overview

When the speed controller clicks and the vehicle does not move that can be caused by several different things so diagnostic testing may be necessary to determine which part is faulty and causing the problem. A clicking controller can be caused by a faulty brake lever switch, a faulty throttle, a faulty battery pack, a faulty controller, or faulty wiring or connectors. However, it can also be caused by a problem with the charging system which is causing the battery pack to not be recharged.

 

Try Pushing The Scooter To Start

Electric scooters with single speed throttles sometimes need to be pushed forward in order to run. Stand on the scooter with one foot and push it forward with your other foot while fully engaging the throttle. Once the scooter reaches walking speed and the throttle is engaged the scooter should run until the throttle is released or the brake is used.

 

Test The Brake Lever Switch

(Tool Needed: Jumper Wire) The brake lever switch informs the speed controller to turn the motor off when the brakes are applied. Most scooters have normally open brake switches, however, some scooters have normally closed brake switches. To test for a faulty normally open brake switch, disconnect the brake lever wire connector from the speed controller and then see if the scooter runs. If the scooter run when the brake lever switch is disconnected from the speed controller then the brake lever switch is a normally open type which is faulty. To test for a faulty normally closed brake lever switch, disconnect the brake lever wire connector from the speed controller and bridge the two terminals together in the controller's connector that the brake switch is unplugged from. If the scooter runs when the controller's brake switch connector terminals are bridged together then the brake switch is a normally closed type which is faulty.

 

Test The Battery Charger Port

(No Tools Needed) If the battery charger is plugged into the wall, unplug it. Plug the battery charger into the battery charger port on the scooter and look for an illuminated indicator light on the battery charger. If an indicator light on the battery charger illuminates when the charger is plugged into the scooter then the wiring and wiring connectors going to the charger port are good and the charger port itself is good.

(Tool Needed: Multimeter) If you have a multimeter the battery charger ports Voltage can be tested. The Voltage level present at the charging port should be the same as at the battery pack. If the charger port has male terminals then great care needs to be taken to avoid short circuiting the terminals to each other or to the charger port's housing if it is metal.

 

Test The Battery Charger

(Tool Needed: Multimeter) After testing the charger port and confirming that it has Voltage then the battery charger can be tested. If the charger port has no Voltage then that issue will need to be fixed before testing the battery charger. To test the battery charger to confirm that it is recharging the battery or battery pack, first test the Voltage of the battery or battery pack to confirm that it is below a 100% state of charge and that it needs to be recharged. We have a Battery State of Charge Chart to help with determining if the battery or battery pack needs to be recharged. Once it has been determined that the battery or battery pack needs to be recharged, plug the battery charger into the vehicle's charger port, and then plug the battery charger into the wall. Next test the Voltage of the battery pack with a digital multimeter to see if its Voltage is slowly climbing. The multimeter should be set to a DC Voltage range that allows reading the tenths or hundreds of a Volt of the battery or battery pack. If the the battery or battery pack's Voltage slowly climbs to a higher number then that indicates that the battery charger is recharging the battery or battery pack.

 

Test The Motor

Look for any burned or melted wires or wire connectors attached to the motor. Burned or melted wires or wire connectors indicate overheating of the motor which may cause the plastic insulation to melt off the motors electromagnetic copper wire windings.

Smell the motor for any burned plastic smells. If the motor smells burned that indicates that its coils have been overheated. Motors with overheated coils should always be replaced to prevent damage to the speed controller.

If the insulation melts off the copper windings they will short circuit and cause the motor to not run or to run slowly. Short circuited motor windings can also burn-out the speed controller by giving it too much resistance which makes it work too hard and overheat.

If the motor wires and connectors look good then test the motor by connecting it directly to a battery or battery pack to see if it runs. This will test the motor only and it will not serve as a test for the battery pack as the motor will run at any Voltage and the controller has a low Voltage cutoff circuit which turn the motor off when the battery pack Voltage drops under a certain Voltage level.

 

Determine The Battery Pack's History

Determine how long has the battery pack has been left in an uncharged state for. If left uncharged for under 6 months you may be able to successfully recharge the battery pack. However if left uncharged for over 6 months then it is usually the case that the battery pack is has become faulty. If you know that the scooter has been sitting for a long time without being recharged then you can safely assume that the battery pack has become faulty.

 

Try Deep Charging The Battery Pack for 48 to 72 Hours

Sometimes lead-acid battery packs need a deep charge to equalize the cells and help the battery pack regain capacity. Try charging the battery pack for 48 to 72 hours and then see if that helps. It is a good practice to perform a deep charge a couple of times a year or whenever a significant loss of capacity is noticed.

 

Test The Battery Pack On A Scooter That Runs

Visit our Battery Pack Load Testing Guide.

 

Test The Battery Pack On A Scooter That Does Not Run

(Tool Needed: Load Tester) If the scooter is not running, a load test can be performed on its batteries by removing the battery pack from the scooter and taking the individual batteries out. The individual batteries can then be tested with a automotive battery load tester. Most entry level automotive battery load testers place a 100 Amp load on the battery which is too high so an adjustable carbon pile battery load tester is required and should be adjusted to place a 30 Amp load on the batteries.

 

Test The Voltage Of The Battery Pack

(Tool Needed: Multimeter) If you have a multimeter the battery packs Voltage can be tested to determine its condition. A good battery packs Voltage will be above its rated Voltage level even if it has been fully discharged and allows to sit a few minutes, or if it has been in storage. If a battery packs Voltage does not bounce back to above its rated Voltage level within a few minutes after being discharged that points towards a defective or worn-out battery pack. When a battery pack has been fully charged and its Voltage is below its rated Voltage level that also points towards a defective or worn-out battery pack. Good scooter battery packs will bounce back to above their rated Voltage level within a few minutes after the scooter has been driven.

 



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