another old battery question

I would put a volt meter on the battery as you are running and see if you
are charging.
Bill

"Ken Blevins" wrote in message
...
Three times in two years my cranking battery has failed me.I fully charge
it
,have it checked at a "battery terminal" and three outings later the
thing
will barely turn it over , much less start it.I know the thing to do is to
charge it every time I charge my trolling batteries , but I always figured
that was what the alternator was for.Do you all charge your cranking
battery every time you hook up to charge your trolling batteries.?
Would
you guess a bad battery or faulty alternator?? Or just someone lazy on the
maintaince end???
Thanks
Ken