Battery/electrical issues. I'm stumped

[Ben5959]

I'm having issues with my 66 c10 327. For reference I've put in a brand new alternator, battery, starter, voltage regulator, carburetor, plugs, plug cables, and distributor coil.

The issue I'm having, everything will be running fine, until I do some serious driving, over 10 miles or so and definitely each time I'm on the highway. After driving, the next time I go and try and start it has a hard time starting as if the battery is not charged enough. Eventually it will start after cranking for a bit, but every few trips this happens, it won't start up at all. Lights will turn on in the cab, but there is not enough juice to crank it over. A quick battery jump will get the truck going, and everything will be fine for a week or so. Then it all will happen again after about a week. At this point, other than replacing all of the wiring. I'm stumped