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Hello. My name is Tan.
Could I get the make model and serial number of the engine please?
How many trim switches do you have?
Have you tried disconnecting each switch one at a time?
If you have a shorted trim switch it will cause the trim to continue running.
Some trim switches are not water proof and when you wash the boat or it rains real hard the water gets inside the switch and shorts the switch causing the trim to run continuously.