We are newly TS certified, but, sometimes it seems that our top management is fearful of continuous improvement and resistant to change.
At times they do not wish to spend time and money on quality tools of any kind.

How can you motivate the top management? Any suggestions?

Any successes? failures to mention:(

Show me the money.

There are likely low-hanging fruit projects you could do with your existing resources and without permission of senior management. Do them!

As you gain a success or two, document what was done, and what the benefits (dollars, safety, customer satisfaction, what have you) are. Make a presentation to your management on these successes.

Then pitch - now if we had (fill in the blank with what you specifically need from "senior management), we could go pursue this issue next.

I am a fan of Tom Peters and Dr. Russ Ackoff. Challenge the assumption that you need senior managment to be "motivated". There is a lot you can do "under the radar", and you can have a failure or two and not be noticed adversely. When you get the eventual success, go sell it.