I agree, swapping the field wires should make no difference if the alternator is working correctly. One set of diodes is slightly different than the other. FWIW A lot of rebuilt alternators, starters,etc get right back out there as the original problem was never found. Just had another "new rebuilt" alternator go bad on a car I just bought, looked brand new but was intermittent after warm-up. I have a local outfit here that rebuilds alternators and starters, been using their Bosch alternators on my Mopars for 20 years, never a problem.