66 valiant no start

Hey guys, working on the valiant (170 slant six, still has points, 3 speed manuel trans). It fired off really easy before but let sit for a couple months while redoing the brake system. Went to fire ot off in hopes of driving it down the street for the first time. It would crank over but not fire. I tested the coil and wasnt getting any fire out of it. Swapped out with a new coil but that coil was bad out of the box. My uncle had a coil off his 318 and that one works. Put an inline coil/ spark plug tester on it and im getting fire out of coil and out of distributor to spark plugs. I sprayed starting fluid in the carb but its not even trying to start. I'm wondering if the battery is just too worn down? I charged it for 12 hours and showed a full charge but it only lasted for about 15 seconds of cranking. But I figured it would have at least tried to fire within that time with starter fluid in the carb. Should I be looking at the electrical box where the it ignition switch and starter wires all get tied together? Not sure of this post would go here, electrical, or slant six form, please let me know if I should move it. Thanks.