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4 to 6 feet? So do you have to buy an extension if going from console of an 18.5 ft boat to the battery in back?
Im not sure on what boat you have, but yes if you want to wire it directly to the battery you will more than likely need to add on some wire.
The newer boats that I have dealt have power leads already ran under the console. They hook into a main fuse panel under that dash that has one set of power leads coming from the battery. Kind of like your house wiring. You have the main panel and then smaller leads coming off of it.
If you have a main panel or circuit breakers near the dash you can tie into one of those sets of power leads coming off of there. Otherwise you will have to run some wire to reach all the way to the rear to the battery.