W126 power seat keep running
 

My passenger seat will not go forward or reverse. Other functions work, for the most part. So I dug under and found a harness was unplugged. I plugged it in and the seat still did not work right, also a motor kept engaging every couple seconds. Seemed it was trying to move the seat but was stuck, yet it kept trying. Thoughts?

Sounds like a seat control module issue.
You can put power directly to any of the motors (plug disconnected) and that motor should work.