Starting issue

[Bill Houghton]

A week or so ago, I was running a bunch of errands in my 1972 3/4 ton Chevy, with fairly new small block engine in it. 65-month-warranty battery, installed in 2011. Everything went fine until the last stop. When I came out from that, the truck wouldn't start. The solenoid would click, but no starting. When the AAA truck came out and put his jumper box on it, we got the same thing initially; then, all at once, it started just fine.

I drove it home, and have started it twice since then with no problem.

Could this be a bad winding in the starter motor? I believe the starter was just transferred over from the old motor, so don't know its age.

If not that, what might it be? Our less mechanical son will be borrowing the truck soon, when he moves into a new place, so I don't want this problem to happen to him.

Any suggestions on diagnosis appreciated.