ML500 Battery Drain

I replace the motor with a new one and after a few days the same problem and code recurred. This time I removed the motor and the small shaft looks like the attached picture. There's a cord wrapped around the shaft. There's a steel core wrapped with some wooly material, may be to stop dust getting in. the cord has been dislodged as seen on the picture. I can't make it stay wrapped. I don't know whether that's how it's supposed to be.
Any thoughts please.
Thanks,
P.S. Both motors work perfectly fine when not installed and powered just by connecting the power plug under the seat! So may be the wrap on the shaft gets jammed in and stop any movement.

MB sells the entire carriage!
Thanks

The Best of Mercedes & AMG


