I have an older M51 with a toggle switch on/off/on. It seem to be failing. So I replaced it with a standard on/off toggle switch. Now it works if you: 1. Turn it on (nothing happens) 2. Turn it off (all 3 lights turn of) 3. Turn it on (Now you can use the chair) Does this make any sense to you?

SOURCE: My wheelchair Pronto M51 dose not move, the

Are the motors engaged? It sounds like it is in free-wheel

SOURCE: only 1 battery charges

The lights are working, the batteries aren't. Red indicates power to the charger, and it should be on all the time. Green indicates a full charge, usually. If one or both of the batteries are totally dead, then the charger can't "see" them, and you will get a green light, but you will have dead batteries.

All power chairs use sealed, deep-cycle batteries. Deep cycle batteries, are designed for slow amperage dischare over a long time period, unlike a car battery that throws out a lot of amperage for turning the motor over. That's called "cold-cranking amps", and you can load-test a car battery to see if it will throw out a ton of amps for long enough to start a car. There is NO load tester made, or possible for a deep-cycle battery. A load test requires a 24-hour time period, and a complicated formula.

So, your course is to get some fresh, gel-sealed-batteries. You will need type U-1. Specify, gel-sealed-batteries when you go to the battery shop. A fresh set should get the chair up to about 12-16 mile range, which would be about 3-4 hours running constantly at high speed. Good luck.

SOURCE: My wheelchair dose not move

The chair has two levers, one for each motor, that disengage it for freewheeling, or pushing the chair without power. These take it out of gear. Place the levers in the locked, gear-engaged position and it should go for you. Here's a link for the manual for your chair, and it will show you where the location is to place it in gear.http://www.invacare.com/doc_files/1125085J.pdf

SOURCE: My Pronto M51 chair does not seem to be holding a

Have the batteries load tested. It sounds like the batteries need to be replaced.

SOURCE: My dad has a mobility

Contact Roadrunner Mobility at 1-800-467-2668. They should be able to help you