Also, if the light fixture shorts to a different ground, power would continue to feed it and probably burn your boat down to the waterline.
" I was thinking of just pulling the breaker and making the switch there."
You'd be laying a landmine for yourself. At some future date, you or someone else will assume that breaker, like all the other breakers, is in a positive line. ZZZT! in a shower of sparks wondering "Gee, how'd that happen?!" you'd remember it was the line you reversed.
Nah, this is not the place to make shortcuts. Unless those wiring runs were made with zip cord, they should be color coded for polarity, better to find the mistake and fix it.
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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.