Correct Battery Routing for 74 Cheyenne? Pics Please!

[Corellian Corvette]

Going through my new truck and trying to get everything back to normal.

I'm really questioning the way the existing battery cables are routed.

Right now, the Neg battery cable is stretched and attached to the bolt that holds the alternator in place. That can't be right.

I got a new replacement from NAPA, which is much shorter and I can't see where it would connect - looks like won't even stretch to the engine.

There is also another connection off the Negative cable that runs to some sort of junction block on the core support near where a 2nd battery would go (it reminds me of a Ford starter solenoid). I'm not sure what that piece is for.

Can anyone tell me (or have good pictures) of the correct battery routing and where the negative cable would connect to the engine?

Thanks!