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Try this:
Always connect your fishfinder first, then connect the battery.
When removing, disconnect your battery then your fishfinder.
Use dielectric grease on all connections, rinse with freshwater asap.
You never want power going to a open plug, that just opens it up for immediate
electrolysis.
If you follow these steps you will mitigate your corrosion problem.
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There's nothing colder than yesterday's hotdog.
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