Should car still run on alternator with ground terminal off battery?

One of the first things I said was I took it to AZ and it tested good according to them. However i feel nothing from the mag field test, and AZ Isnt exactly known for their genius "tech". I believe it was them that sold me a dead battery years ago (that I had asked them to check for charge in store before I got it home). Got it home, car still didn't start, ended up then changing a starter motor.... for nothing.


lol It was late I missed that....but I did say it's usually safer