2008 saturn aura 3.5 no start

Interesting, do you mean the starter signal wire was loosing connection (power)?, as the starter grounds to the engine block…
Fuse boxes typically will get corroded and loose connection… If they ground out, it will either blow a main fuse or potentially catch the vehicle on fire…

I think you are on the right page, but a little confused on how the whole power ground thing works…

Anyway, Welcome to the forum…