Ok I will try to make this simple if I can
parts
Ford starter relay
cable to join batteries to relay
place your new battery....join the negitives together.......move all connecting wires from your old battery ( these will be lights and radio type things)EXECEPT the large one that starts the motor. add a battery wire from your old battery to one side of the relay and from the other side to the new on ( with all the small wires you remover ( your batteries will be joined by the relays now) ...one of the small wires from the relay goes to ground...heres the trick...the other must be put on the back of the altinator....when the motor fires on the good battery it will make the 12V ness. to close the relay and start chargeing the other one while underway. you can also just run a wire to the dash (switched) so you can power the relay manually ( just don't forget to switch it off when your sitting...My boat has been this way for years and is easy to do and when the radio and lights kill it you can fire it up and charge it
Good luck
Jeff
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