TRY TAPPING MOTOR/S? Sometimes, motor brushes stick and disconnect, and tapping vibration lets spring push them back into contact? Or push-on connector brushes loose needs slight pinch? Some brands of motors you unplug, which releases brake, and you can then push slide in. Some, you may have a shear pin or cotter-pin to remove linkage connection to motor? Good Luck.
2000 Conquest LE 6266, Class-C on 99-E450SD, 6.8, 2v, V-10