I checked out my fuse that also controls the AC, & it's ok. Is there another electrical component that also runs the Cruise that I need to check out, or would it now be a mechanical problem?

 

Could be the activation switch, wiring to the switch or the cruise control module itself.

 

Have you moved the cable at all? With some headers you have to relocate the cruise control cable. If you don't clip it back at the brake booster to hold the sheath in place, it will stop controlling speed. The unit will work, but the sheath will move and won't allow the cruise cable to properly operate the throttle body.