what alarm
is it low oil or temp alarm,,i had a 150 opti that was mounted high on the transom and at speed or certain slow runing with bow up the low water alarm would go off,,ended up was just air around top water holes in cav plate ,,filled top holes with epoxy and never happened again,,but if it resets after re starting,,it could be an ecu black box problem,,ask if they have a s/h 1 you can borrow,,
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