"sonofadocker" wrote in message
oups.com...
can anyone tell ma how to use to batteries for my boat.
i would like one to run the motor only.
one to run all the radios,lights etc.

thanks

sonofadocker

1980 wellcraft cc 85hp
1975 sportcraft cuddy 150hp



You will need a dual battery switch. This is one example of that switch:
http://images.westmarine.com/full/115081.jpg

The manufacturer will provide a wiring diagram with the switch. This also
may help: http://www.bluewatermarinesvc.com/html/bat_switch.html