BIG 3 Help!!!

So I am attempting to install my upgraded alternator and big 3 this is a first time for me with both situations. Everyone from here has been super helpful so I was hoping you can bail me out since my car is in pieces. I have currently removed the original alt and put the singer alt in that I purchased. I have not connected  any wires yet this is where my confusion has started. I have located my grounding wire from engine to battery and will upgrade it which is one of the big three. Now the other two is where I am getting confused.

1.The alt I purchased from singer has an upgrade to increase my voltage and the device he put on has will not allow me to re attach the two connections which I took off the original alt. (this confused me). And I will have a connection not going any where so I am assuming to just seal if up so there is no interferance. He was telling me something like this when we spoke but that has been a bit and I cannot remember exactly what was said. I have reached out to him but havent got a reply yet.

2.Then the Cable that bolted to the back of the alt I am currently having trouble tracing its path. So I am unsure where it goes.

3. I have a positive location for convienance which runs from battery to a connection point then continues on to a device attached to engine which I am unsure what it is.

4. Just so its stated the are two wires that came off the stock positive battery post. One of which I spoke about in #3 and the second wire runs into my fuse box located under the hood.

I am sure I have left somethings out please help me I need some

Here are some pics I have taken to try to explain what I am looking at.

I can take more if it is requested and/or needed.

Like I said when I started this is the first time I have done either of these.

This Picture is of my original alt and you can see the two connection points(Referencing question #1)

This is the new Alt and you can see how I am unable to connect the two locations.

This is where one of the wires off the positive battery terminal goes too and then is goes on to this device in the picture following this one.