Flobo I assume that its the on-board charger and that it is the gray charger with one light. This charger light will only come on when the chair is fully charged. Now if you have left it plugged in all night and still have no light then I would think you have a bad charger. If you have a digital voltmeter you can check the battery voltage throught the external charger port under the joystick. Set it on 200 volts and insert each probe into the outter pin holes and you should be able to read the voltage. Without the charger plugged in you will be reading the total battery voltage 24-27 volts with the charger plugged in 27-30 volts also check the meter with the charger plugged it should show something above zero and gradually decrease as the batteries become fully charged. Hope this helps
SOURCE: CHAIR BEEN SITTING FOR A
Ed After a year the batteries are shot and the charger cannot revive them Sorry but you're gonna have to spring for 2 new U1 batteries. Hope this helps you
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