Seeing amp draw is a good sign there is an easy to fix problem that will exhibit this symptom. Take the motor off the regulator by removing the two screws. This leaves the regulator in place and the glass will not fall. Some years use Torx type fastners, some years use hex. (as DR said the motor is at the end of the wires) 95% of the time the bottom bushing will have gotten water in it and the armature will get tight in the bushing. Carefully remove the plastic part that holds the motor-brushes. Pull the armature out then clean and burnish the end of the armature. Using light machine oil wet the bushing and felt donut well. Reinstall the armature and carefully fit the plastic top that holds the motor brushes. Carefully push the brushes back in their holders as you slide the plastic holder back into the motor casing. Be sure the black rubber seal is in the right place when you reinstall the motor. A light and mirror helps out with removal and install.
Remember "Installation is reverse of removal"
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