She wont start a few o's

[Dadsredwagon]

65 model 230 engine

go to start her today... she act like the battery is dead , so I hook up the charger, no difference.. dry to jump it off with my F250 truck no luck it will engae the stater but acts like it will not turn over , so I disconnect the battery and try and run battery cables straigt from anther battery via cables, no luck just acts like there is not enough juice to turn her over? I hear the starter engaging but nothing else

any ideas ya'll?

thx