How to recharge but I get a flashing red light on transformer in battery box. this is a Invacare Pronto M91 Electric Wheelchair

wcdoc1953

• 280 Answers
• Posted on Feb 13, 2011

SOURCE: Had the Pronto M91 invacare wheelchair in the Push

You definitely need new batteries. After that amount of time the batteries go bad and the plates inside become sulfated. They are only good as boat anchors now.
It is a easy do it your self repair. There are 2, Group 22 batteries in this model. You want to get deep cycle sealed lead acid, preferably AGM (advanced glass matt) group 22 batteries.
Flip the seating system back by releasing the lever under the front of the seat.Make sure you do not pinch the joystick wiring at the back when you do this.
Remove the black plastic cover.
The batteries will be secured by a strap which you should unbuckle.
Disconnect the plugs to the batteries and note how they are run, oriented and connected.
Pull out the batteries, one at a time, from the base.
Make the wiring connections to the battery , put the batteries back in the chair, plug everything in and you are set to go. Hope this helps.

SOURCE: Invacare Pronto Sure Step M91.

Good day!!!!


Please try to reconnect all connectors on the board...

after that try to test the machine...if persist,please check the voltage of your battery if it is 12vdc it should have at least 11vdc and if 24vdc it should have 23vdc...if the battery is lower try to replace it..

If the battery is good the problem is on the main control board..

if that so you need to replace it..please contact your manufacturer or dealer to buy the parts you needed..

Thanks for using fixya..

Have a nice day!!!