Not laughing at all. This is troubleshooting 101, DIY style. It's very easy to misdiagnose and chase your trail. I've done it many times and am trying to get smarter. Thanks for keeping us updated, This is how we all learn together. Many good ideas and suggestions on this post with you doing all the hard work. Hope the new battery and rebuilt/rewired column gives good results.
Tests you need to do in the future with new battery.
1. Test battery at rest. Test across the posts and get 12.6V or close. Battery good.
2. Test battery, motor running. Test across post, and then across post clamps, to get 14V or close. Alternator good.
