.02 more -
Automotive and Marine electrical systems are VERY different. You can get away with things while working on a car, that will not last long on a boat. Butt splices, wire nuts, and no need to run a return line are three things that come to mind quickly. Also the ABYC has a wiring color code that will make your life easier (what does this wire do?) that is not used for automotive applications.
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USCG Licensed OUPV Captain, ASA 101/103/104/105 Certified - Also certified in Recreational Marine Electrical Systems