I wouldn't ground it directly to the battery terminal, but to the 12 VDC system negative ground post or bus bar instead. Also, the distance determines what gauge wire to run. Look at the Autopilot
's maximum amperage draw and base your wire size on that.
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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.