More likely you have a grounding condition. You need to make sure you have no corrosion at the ground wire or attached wire butt connectors. Tracing 12V issues on a vessel is challenging
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1978 23' Superfish/Potter Bracket 250HP --------
as "Americans" you have the right to ......
"LIFE, LIBERTY and the PURSUIT of a Classic SeaCraft" -capt_chuck
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