Harold, you need a new on off switch. You can open the case and solder in a replacement switch after finding a replacement. This is your least expensive option. You can also send it to be rebuilt at Monster Scooter Parts or to the Wheelchair Wizard in Sacramento. Hope this helps. Scott
I have an Invacare Pronto M91 with the SPJ+ controller and it was doing the exact thing you describe. Easy to turn on, but very difficult or impossible to turn off. I replaced the keypad on the controller and now it works like a champ. Easy on-Easy off!! I believe the key bad buttons have graphite on them and then it wears off with time, causing the above issue. They can be ordered for about $32 from Monsterscooterparts.com
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