Tried a known good battery from my dads 94 Cobra, identical issue. So I know the car will crank with no battery but power hooked up directly to the terminals. Will not crank, but rather click once and shut off power completely when started with battery. Jacked up the car and inspected grounds. I see the block to chassis ground strap (replaced two years ago) and terminal to block cable. Both look perfectly fine but will pull and clean them off.