Wiper Motor Problem with Speed of wipers

[bonfire1009]

First off let me inform you I am not mechanical incline and I cheated and had a shop install my wiper motor and they do not return my calls.
My wipers move at the same speed, on High or Low, but when I turn them off it moves faster.
A friend told me that it could be the ground, I haven't tinkered with it because its still in storage and I don't want to start tinkering and next I know I have to find a shop to fix my errors in deduction.
Any help is welcome.
Thanks,

[charger Downunder]

Try earthing the wiper motor to the body. Did they put the earth strap back on it should be easy to see.

[Passion4Mopars]

If this is a two speed motor, here's bench test procedures for it

http://passion4mopars-moparbodystyles.blogspot.com/2011/02/2-speed-concealed-wiper-motor-bench.html

three speed bench test procedures are also located on the same blog spot.

You only mention two speeds so I'm making an assumption that it's a two speed wiper motor.  I've seen 3 speed motors run at the "wrong" speed on different settings, when I get them in for repair, the bulkhead clip is wired in the wrong order, thus wrong order of speeds?