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The Scotty design leads to these issues. The motor is mounted below the spool and contained in a plastic cup. If water gets in there it has no place to go other than soak the motor. The motor spindle comes up through the top which is an opening that water will get through. If you spray the spool water gets in there. After replacing several motors, I lightly rinse the boom only, nothing around the motor housing.Scottys are easy to fix and Connor sells all the parts at the best prices I have found.From my experience, the Scotty warranty is about useless. To use it, you have to pull the downriggers, send them to a shop that is likely backlogged 2-4 weeks where you won't be fishing. Of course, they always break right in prime time, so I just pay for the parts and fix them myself.
The motor itself also holds water, the bearing at the bottom is the one that fails probably 90% of the time as any water basically just sits on the bearing.I've gotten pretty good at replacing rotor bearings.If you could somehow run the downrigger upside down or the motor was on top it would be far more reliable.