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I have a 1987 15'SS with a 70hp yamaha. It is docked in a canal at the house. When I looked out the window I noticed that the engine was in the "up" position then minutes before I had left it in the "down" position.

When I examined the boat I found that trim motor was operating and could only be turned off by disconnecting the battery cables.

Any suggestions, this is very strange,

Mike

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Check all your connections and switches.

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It seems like there's a corrosion issue as that is typically the case when a system starts to act as if it "has a brain of it's own". Your relays are either "stuck" in a shorted position or your trim switch on your throttle is stuck.

Do a visual inspection first and see if there's anything that's obviously wrong before tearing into your system. Sometimes an issue can be attributed to something that's simple and easily looked past.

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Thanks John and CES, sometimes things such as this are just a loose connection. I went thru every connection until I felt one "snap" into place. Problem solved....back on the water!

Mike

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Fantastic news Mike!!