the voltage at the alternator charging post is 14.3 while running correct? that means alternator is working fine. once you shut the car off that post should read what the battery reads. as far as the 11.75 volts. if it still starts the car than should be good. my car sits outside and my voltage reads 11.5 somedays and still cranks right up. How old is the battery? the fact that it passed the load test tells me it must be good. But depending on age, eh , you may wanna think about replacing it soon.