Is it possible you wired the ignition switch wrong (or simply left it in the on position, like I have done before) and the ignition was powered when you left it overnight. If that is/was the case that would account for the battery drain. On the ignition switch both the ignition and accessories terminal are electrically connected together. So if you wired it incorrectly, even if you switched off the key, the ignition could still be powered.
If you find that to be true, you may have also cooked your points, condenser and coil.
Last edited by Phak1; 06/27/2020 5:53 PM.
