Glad you got it fixed!
A couple of points:
There are no manufacturer or other identification marks on this. It is probably the 20th crimper I've owned; by far, the best. It's a ratcheting type; results in a lot of crimping power. I think I got it online through an electronics supply house; about $50 I think. Money very well spent.
That crimper is not intended for use on such large connections. See the colored dots? Those correspond to the standard crimp connectors like these:
http://www.delcity.net/store/Butt-Connectors/p_801793
Using that crimper for battery cables will greatly shorten the life of that crimper, and will give you a less than adequate crimp. It might seem fine now, but it's just not going to hold like it should. That crimper just isn't capable of applying enough force. It's not made for that job.
Your cables look a bit on the wimpy side, to me, and those connectors are not the latest and greatest. You should give some thought to re-doing the whole shebang with adequate cables and decent terminals.
With these old vehicles, pulling and tugging on connections is a good way to break things. That's good, because you want it to break when you are looking for problems, not when you are toodling down the road on your way to a hot date or a job interview.
A volt meter will give you good voltage readings when there's no load on a circuit, even if there's bad corrosion or loose connection (or both) upstream of a measurement point. A test light would have shown you the problem. Meters AND test lights are good tools to have and use.
![A toast to MV's :beer: :beer:](https://www.steelsoldiers.com/images/smilies/beerchug.gif)