We had this same thing happen to us on our previous boat.
It was caused by a faulty ignition key switch. It was
the type of switch similar to a car, where you turned the
key all the way to the right to the "start" position to
start the engine, and when it started you released the key
and a spring pulled it back to the "on" or "run"
position. ...
Yup, that's exactly the problem! While we were moving off
of our original position, the port engine had stalled out
and I
restarted using the fly-bridge switch. First time using
that
switch. I thought it "felt funny" at the time, but checking
now
I discover that the key will now go through a full 360
degree
rotation and cannot be removed! Further, it is still
providing
power to the oil pressure alarm buzzer, while at the same
time the 12V feed to the Kill switches is broken.
...
To prevent this problem in the future, I replaced the key
switch with a simple "on/off" type switch and installed a
starter button in series with the switch.
I'm going to have all the starter wiring replaced (I didn't
get things turned off in time to salvage any) and will most
likely take up your suggestion to use a more simple START
circuit.
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