Please help with wiring
 

I purchased a 75 TA under construction. After installing engine and connecting wires I could not find the familiar wire which on my GTO runs from the starter to the fuse box. How does this car get battery juice to the inside of the vehicle, I'm lost I don't see any left-over wires, Please help I am ready to drive but for now I am having to back feed through the alternator hot wire. Thanks

75 doesn't have the wire from the starter to the fusebox or alternator.

The alternator hot wire goes to the battery. (plus another to the fuse box in the wiring loom)

Where is that wire I don't see anything extra, could you explain in detail? Thanks

75 Engine diagram:

Probably a separate wire that is just connected to the alternator post and to the battery post. (usually had a pigtail I believe)