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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.
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.
Mckinzie the lights will flash when charging because of the inhibit mode. After you unplug the charger and turn the chair on do you get any lights at all on the battery indicators? If not lift up the seat and check your battery cable connections the neg cable from the rear battery should be connectd to the positve side of the front battery and the rear neg should plug into the small connector of the other cable. Make sure then that the large double plug is connected to the double plug going to the controller. while the seat is up then turn the chair on to see if all the lights come on. If not check that all your connections at the battery posts are tight. Also check under the two red positve battery post covers the two fuse links to make sure they are not blown. If all of this checks out the chair should come on and operate correctly 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.
Hi Bob. Unfortunately in most cases this means that the batteries have gone so flat that they cannot be “revived”. The best thing to do is take the batteries to a local battery dealer and have them checked. You may need to replace them. Another possibility is that because the batteries are so flat, the charging circuit hit a wobbly trying to resuscitate them and popped a fuse button. A simple reset may help. Happy scooting. Regards Chris… firstname.lastname@example.org