Can't charge Pronto M91.

The red light on the transformer/Charger means the charger is bad. Sometimes it can also be battery harness wiring. Most often it is the charger that needs replaced.

The M91 has an onboard charger. When unplugging the charger power cord from the wall outlet does not stop the chair from being in the charge mode, The charger has to be unplugged from the wheelchair wiring harness or main control module under the plastic body parts. The on-board chargers fail like this sometimes.

Check the charger output to verify whether or not you have a bad charger using a voltmeter. These smaller batteries are notorious for having a short shelf life and poor quality control from the manufacturer. Load test the batteries after you verify you have a working charger that will bring the batteries up to the proper voltage first.

I had this exact same problem after having my M91 in the shop. The repair man said that the onboard charger was bad, so he sold me an offboard charger to charge through the arm. That didn't change anything. I finally took it apart myself and discovered that there was a cord leading from the onboard charger to the batteries that the repair person had left unplugged when he installed my new batteries.
What I'd thought was "fast draining" of the batteries was actually the batteries self-charging overnight (which they will do a little bit if you let them sit). Of course, this might not be your problem, but I'd say at least look at it as a possibility.

Randal the problem sounds like a battery issue. If after charging you get a green light on the charger and the batteries run down quickly there is one or both of the batteries that is weak and cannot handle the load required by the motors. If Medicare paid for your chair contact the provider that sold you your chair and ask them to come replace the batteries. They should then bill Medicare for the batteries. Hope this helps

imwaltz Sorry buddy but if it sat that long the batteries are probably too low for the charger to pick up and charge. to bad you didn't just charge those batteries once a month while you were laid up. You will have to get new batteries. If Medicare paid for your chair they will pay for most of the repair costs. Contact Repair Xpress @ 1-877-581-3733 or Roadrunner Mobility @ 1-800-467-2668 these are 2 excellent service companies that will bill Medicare for repair and have a tech repair the chair for you. Hope this helps

Your chair has a motor problem. The code does not tell which side it is. Make sure both motors have the brakes in the drive position before turning on the chair. Also check that both motors are plugged into the main control module in the base of the chair.

Batters won't hold charge and work properly it sat up for that long. replace batterys

sounds like blown fuse which is at rear of chair. may be underneath rear cover. this fuse wont keep the chair from working, however, it will keep the charging from working.

sounds like bad batteries