MwrEngineRepair
New member
So I am starting up my spring maintenance and I have two identical boats and engines. they are both 150HP Mercury outboards 2016 2B376587. I have just finished all my maintenance and started the engines but found that I can not stop the engines by normal means (both engines are doing this). The throttle is in Neutral and idle. I take the ignition key out (still running), remove battery disconnect key (still running), remove negative lead from battery( still running). I have to remove the Fuel fuse to finally get it stopped. what should I be looking for on both engines.