Walmart tested the battery - read 9v, hardly 0 amps, REPLACE BATTERY.So, as I assumed, Autozone sucks. Also, replacement/original type battery is side-post and whoever had the truck before had changed it to top-post terminals and battery. Had I known/realized this when I bought the replacement cable a few days ago I woulda put the right type back on. Damn Autozone. Damn.

Anyway, a new battery and cable later and she started right up. Many thanks to all the tipsters above!