Sudden shutdown of 1992 Mercury 90hp

[Eastbayview]

I have a 92 Merc 90hp 3 cylinder which will suddenly shutdown at various speeds and appears to happen when the engine gets warm. When this happens it is like a light switch . Running one second, then shuts off the next. It does not start to miss first and does not act like it is running out of fuel.
After 3-4 times of this occurring the engine would start up like normal after it sat overnight. Take the boat out and after it warmed up it would quit again. Last time it happened it would not start even when cold.
Any ideas on what the issue could be? My guess is the voltage regulator?
Thanks for your help.

 

[Eastbayview]

I have a 92 Merc 90hp 3 cylinder which will suddenly shutdown at various speeds and appears to happen when the engine gets warm. When this happens it is like a light switch . Running one second, then shuts off the next. It does not start to miss first and does not act like it is running out of fuel.
After 3-4 times of this occurring the engine would start up like normal after it sat overnight. Take the boat out and after it warmed up it would quit again. Last time it happened it would not start even when cold.
Any ideas on what the issue could be? My guess is the voltage regulator?
Thanks for your help.

Does anyone have any thoughts into this issue?

 

[Raym03]

I am having the same problem with my 2005 90 hp. Did you solve your issue?

 

[Texasmark]

My guess it's spark, not fuel related due to the un announced immediate shut down. I have had CDI module temperature problems on an '02 engine but that only affected 1 module and the others kept running. Common denominator is the trigger pickup coils, 12v to or back from the control box, or ignition kill ground from the control box would be my guess. The confusion factor is being temperature related for wiring problems.....possibly 12v wiring fuse having a corroded connection....maybe.