Take the battery out and put it in the boat.

There is no such thing as a free boat. A 1975 boat probably needs a
lot of work. My initial thought would be that the reason it was free
is because it needed more work than it was worth.

Rand_man50 wrote:
we just got a free boat , it wont start, the battery is bad ,we tryed to jump
it with a truck,would this work does it need a marine battery, when we tryed
to jump it we couldnt get enough crank it would turn over slowly.Any ideas