So I'm on my 2nd battery...but why?

[crazeetxn]

Howdy all -

My son's truck is a '69 with a 327. We bought him an interstate battery when he first got the truck. He didn't drive it much on account the previous owner had antique plates on it (In TX, those are pretty much only good for parades). Battery went out after a few months.

He bought another one from AZ because it's in town and he can take it back if it goes out. Well, now it needs to be jumped to get started.

He changed the ground and starter wire. There's the one wire that goes straight from the postive to the alternator. Then a couple of wires that go from the alternator to a block thing on the front with a bunch of wires going all over the place from there.

I'm sure it's due to lack of driving, but I wanted to see if I was missing something before I let him on the road with it and he gets stranded somewhere.

All the lights and horn and stuff work.

The alternator checked out good so now we're at a loss.

Thanks for the help!