At Last! Got rid of that last bit of annoying pulsating drone in the car at 2700 rpm. You would not believe it- it is the alternator/belt system. Went to put on new belts, PS first. Start car, NO drone. drove for a day to make sure. Added alternator belt and drone returned. Tried adjusting tighter and then looser till it finally wet away. On my belt system alternator belt wraps around crank pulley and alternator only. Now I have 1 to 1 1/4" belt deflection but it did the trick.
