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I suggest you should follow these guidelines, they should mitigate your corrosion problem.
1. Make sure connection is clean and dry, use dielectric grease don't over due it.
2. Always connect fishfinder first.
3. Connect battery
4. Disconnect battery.
5. Disconnect plug/s from fishfinder.
Don't ever let your connections come in contact with seawater with the battery connected! If you do rinse it immediately with fresh water.
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There's nothing colder than yesterday's hotdog.
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