Until you have the boat, you won't be able to tell what you will need to do. As PBZ has pointed out, many older boats have been upgraded and will need less work than ones with all original wiring.
If you do decide to re-wire a boat, I would highly recommend ripping all the old wiring out and starting from scratch. This is often faster and easier than trying to make sense of the rat's nest that is usually found on most older boats...
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.