[VetteVet]

Well I thought you would have some replies by now but not so far so I will
put in my 2 cents.

The whine you are hearing is probably the points inside the regulator. They are closing and opening so fast that it makes a whining noise. I thought at first that you had a digital regulator but it looks like it may be a points type.

You may have the wires reversed in the alternator plug. The no. 1 or F wire in the regulator goes to the F terminal in the alternator. This is usually a blue wire in the harness. The no. 2 wire from the regulator goes to the R terminal in the alternator, usually white, The no.3 three wire from the regulator usually 12 gauge Red, goes to the main terminal in the harness, a soldered junction.
The no 4 terminal goes back inside the cab to the key switch this is usually a 16 gauge brown wire. It changes to a 10 ohm resistor wire inside the firewall terminal which then goes to the key switch to the accessory terminal.

One important thing to be sure of is to ground the voltage regulator and the alternator I think I see the ground wires in your pictures.

If your wiring all checks out then I would take the alternator back and get it checked.
You will probably get advice to convert to an internally regulated alternator which many here on the forum have done, and it is a good idea for those that can't get the external ones to work.

There is nothing wrong wit the external regulators for the original trucks but when we add accessories like electric fans and stereos then they are underpowered. There are other reasons to go to the internal regulated alternators as well. But for the older stock vehicles the external regulators work well.

In my FAQS thread at the top of this forum there are several threads on electrical problems and doing the conversion. I would refer you to those.

If you have any questions please post back.