My pronto m51 when i charge it the lights do not come on until i push shut off again

The m51 is notorious for failure of the on-board charger. An easy check would be to plug an off board charger into the 3 prong female charging receptacle at the front of the joystick to see if you can bring the voltage up. You can test the on board charger with a voltmeter at the battery connections or charger joystick port with the charger plugged in. Hope this helps

why did you change the batteries, did you verify that it wasn't the charger in the first place, sometime the charger will appear to charge but actually isn't. put a meter on one battery then plug in charger if voltage goes up charger is good if not look for loose connections and or bad charger.

Battery is shorted or may have cristlized replace battery. This will solve your problems.

sounds like a charger inhibit problem. Whenever you charge your chair the charger inhibit shuts down the chair so it can't be moved while charging. If you are getting this then that function is not working. Lets try this if you know of someone who has a chair or scooter with an off-board charger see if you can borrow it. Plug the off-board charger into the charger port located under the front of the joystick (don't have the on-board charger plugged in) and then turn the charger on. turn the chair's power on and you hopefully will see the lights blinking again indicating a charger plugged in (charger inhibit) the lights on the charger should be red and yellow (yellow turning green when fully charged) If you still get the problem with the off-board charger then your problem is in the controller or power module and this requires a new one. If Medicare paid for your chair you can call Repair Xpress @ 1-877-81-3733 or Roadrunner Mobility @ 1-800-467-2668 to have them fix it for you and bill Medicare for most of the repair costs. Hope this helps you

Eduardo After using your chair and the battery level lights are down with yellow or red lights showing just plug the chair into the wall socket and let er rip. Now really after using your chair during the day and you are ready for bed just plug in the charger and let it charge over night. In the morning unplug the charger and you should be set for the day. If you don't use the chair everyday always put it up with a full charge and about once a week plug it in and let it charge overnight. Never leave the chair plugged in all the time and never leave it for more that 24 hours. The charger has two lights on it one red and one yellow or green that are hard to see because they are under the rear cover. When the chair is fully charged the yellow light turns green and you can unplug the charger and you should have a full charge. Hope this helps you

Jo, nope you are safe. Most of the chargers are designed to cut off and go into trickle charge once they sense that the batteries are fully charged. The problem with overcharging comes after 18 hours or so. You should never leave the charger plugged into the chair for more than 24 hours. On the M51 the charger is built into the chair so just plug it in when you go to bed and unplug it when you get up and you'll be ok. You can check for full charge by looking at the charger there should be a red light and a green light when fully charged. Hope this helps

Did you replace both batteries? How old is the chair? Sometimes the on-off keypad becomes worn and does not make contact with the on-off switch. When charging the joystick lights can light up but after unplugging they should remain on. When you plug in the charger look under the rear cover at the charger you should see 2 lights, one red and one yellow to indicate that you are charging the chair if you do not see both lights lit then the charger is bad or has a blown fuse. Only a Tech will be able to tell what is wrong. If Medicare purchased your chair then they will pay for most of repair costs. Contact your provider or a repair service company

With an M51, a full charge will be indicated by all three joystick indicator lights lit- red yellow green. The green far right LED is the full charge light. Also the charger has indicator lights that go from red/yellow to full green at full charge. Hope this helps

Margie,   Yes you may charge it overnight. If you use it everyday,charge it every night. Once the charger senses 24 volts it stops sending a charge,so they cannot be overcharged.  I suggest when you go to bed put on the charger and unplug it when you get up in the morning.