1985 745t

A couple days ago I posted about adding an aux input to my OEM TD-314X stereo and got some great responses. In an effort to learn more about this system I'm trying to create a wiring diagram for reference. That said, I'm wondering if someone familiar with the unit and the amp that goes with it can ID the wires for me.

The list below details what I found when I examined it:

RADIO WIRES:
Orange wire - to two prong plastic connector with black wire, disconnected
Black wire - to two prong connector with orange wire, disconnected
Grey wire - connected to a piece of speaker wire, target unknown
Blue wire - fuse case in middle, disappears into dash
Green wire - fuse case in middle, disappears into dash
Yellow wire - fuse case in middle, currently disconnected
Large Connector over white nub in duplicate socket (pulling nub deactivates system)
Large Connector to dongle off right rear of radio - I believe this is the antenna?

AMPLIFIER WIRES
Green wire
Yellow wire
Brown wire
Black/Yellow Stripe wire
Black/White Stripe wire

If anyone can ID these wires I would be VERY grateful. In addition, the following are some question based on my observations.

Is the green wire present in both instances the feed from the stereo to the amplifier?

What's the secondary socket with the white plastic nub for on the back of the radio? Is it a secondary output or a power out to a secondary device or something? The nub has little prongs that loop whatever is coming out of the socket...

Thanks in advance for any help, it's tough to find information on these OEM stereos.

Best,
-Rick