As far as the generator is concerned, if it's bolted to the block, it's connected to ground! The block is supposed to have braided grounding straps to one, or both of the forward engine mounts to the frame of the car. It's entirely possible that those ground straps were overlooked on assembly of the car.
The generator has two wires, connecting to it.The lighter gage wire is for the field, and the heavier gage wire is for the armature. The terminals on the generator, and the wires are made purposely different to prevent wrong connections.
The regulator, if it's the original design, has three terminals. One, is marked "BAT", and connects to the battery, through the ammeter on the dash. The one marked "Arm", or possibly "GEN", routes through the harness to nthe generator armature. Likewise, the one marked either "F" or "FLD"connects directly to the field, through the harness. I'm more familiar with the 41 cars, but there may be a terminal block on the inner fender for these connections, before they reach the generator. In any case, that's how the connections go to the generator.
One more thing here. When the generator is in place, and all things connected, the generator needs to be polarized. This is simply flashing the hot side of the battery to the armature terminal of the generator, qiuckly. In many cases, the generator will simply not "build up", and begin charging, unless it's polarized. This also insures that the generator hasn't been polarized in reverse, and would run in the wrong polarity. That could be messy.
