another not charging thread

i have been reading some of the older and other threads about this topic. None of them are the exact scenario. so here goes.

I recently had the engine out of a 67 Belvedere . it took a lot longer in the engine shop and by the time I put it back in the wiring was not in recent memory.

anyway after getting it back on the road eventually I had a dead battery. the battery was brand new.
battery has been tested as ok by my brother who works at the part store

it wasn't charging so I bought a new alternator. which didn't fix the problem
-first question the second field I have grounded to the body of the alternator, is this correct?. car has the old style voltage regulator.

I replaced the voltage regulator also which did not fix the problem.

facts to know
-switch on there is juice at the regulator, off- none
-its reading voltage nearly same at battery and alternator field one, where the green wire is connected.

It has a oil pressure switch that is wired to the system. I could not remember the wires it has three. it would not start and I had to switch the wires around to get it to start