'50jrod3600,
bill1949 speaks the truth. It isn't the battery, it's more than likely the starter or cables and connections.
I think a typical starter current draw (6 volt) is around 250 amps. Anything way more than this and it tells you either the starter has a high internal resistance, or a little less likely, there is something in the mechanics making it REAL tough to turn the engine over.
Were any cables replaced recently with the new battery. The six volt systems requires cables the size of a old growth Redwood tree. The large cables need clean connections too.
My bet is on the starter. They are pretty easy to pop off and peek inside. Brushes and bushings are plentiful and you will feel like Mr. Goodwrench after you fix it up and it starts on the first crank.
There CAN be mechanical problems that cause this, but most of the time it is the starter/cable situation.
More folks will be along with more good info!
Stuart
