I'm getting an alarm at the control console. When I turn the key on, without starting, I get a constant alarm. I've changed the engine fuel filter (no water), changed the fuel-water separator (no water), changed the oil and filter and put in a new water pump impeller. The engine starts and runs fine. However, I still get the constant alarm when the key is turned on without starting, That alarm stops when engine is started and a constant buzzing starts. I don't know what else it could be.