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Message: <blockquote data-quote="Jepalan" data-source="post: 8154444" data-attributes="member: 655519">Head unit is likely bad, but there are a few more things to check...- measure the DC voltage at the head unit to make sure it has enough voltage. Sometimes under-voltage can cause strange noises in electronics as internal switching supplies struggle to buck the voltage to usable levels.- Does your boat have an alternator &amp; voltage regulator system?  If so, then first make sure it is not injecting noise into the power chain by running the head unit off of a battery only for a little while (connect amp(s) and head unit to only the battery and see if noise goes away.- If noise is gone when running on battery only, then you might need a bigger alternator, or new voltage regulator or a noise filter on the power lines to your head unit.</blockquote>

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