Spray, humidity and vibration work on marine wiring in ways a garage-kept vehicle never experiences.
Marine electrical systems live in a genuinely harder environment than anything on land — spray, humidity and the boat's own vibration all work on connections and wiring in ways a garage-kept vehicle never experiences. Corrosion inside a connector, not the component behind it, is the most common actual cause of an electrical gremlin.
Batteries, wiring and electronics all get diagnosed with the same logic — starting at the power source and working outward — and this is qualified-technician work rather than something to troubleshoot yourself, particularly once you are past checking a battery's charge and into wiring or connections.
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