Continuous Warning Horn with Motor Off

[dave25]

The Warning horn on the control box started sounding over the weekend (2006 90hp 2-stroke w/power tilt/trim) - cooling system was working properly and the oil tank 3/4 full. At the same time the Trim Gauge stopped working correctly - says "up" all the time. The warning horn is now sounding with the motor off and the key at "on". Could this be due to incorrect trim status/bad sending unit? Any insight would be appreciated!