2004 optimax 150 no fire on #4

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I just bought this boat and did a compression test before purchase but failed to realize it was down on power . Come to find out it has no fire on #4 .
I switched #4 coil to #6 for testing . Coil , spark pug, and plug wire tested good.
Im not getting and power to that coil. Any ideas where to look from here ?
Thinking a broken wire (hope) or possible ECM fail
motor is a 2004 Optimax 150 ser. OT862351

 

[vroom ZOOM]

I just bought this boat and did a compression test before purchase but failed to realize it was down on power . Come to find out it has no fire on #4 .
I switched #4 coil to #6 for testing . Coil , spark pug, and plug wire tested good.
Im not getting and power to that coil. Any ideas where to look from here ?
Thinking a broken wire (hope) or possible ECM fail
motor is a 2004 Optimax 150 ser. OT862351

I think you figured it out yourself... easy enough to test the wire. Also check that the grounds are clean and tight, and that ALL of the pins in the ecm plugs supply power and ground where needed.

 

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I have searched and searched and so far im not finding it . There are 3 wires on the plug that goes into the coil. Black is ground and I tested it where it goes to the block. red/yellow stripe and green /yellow stripe . I dont have a diagram . the red /yellow is on all of them so im guessing the green/yellow is my culprit. I think i found it at the ECM but if so im not getting anything with a test light engine running . that said it may not have the voltage to light the light. thinking about jumping it at the ECM to the coil . but im afraid if im wrong ill shoot something causing more issues. any thoughts ? Im puling my hair out here. dont have much left as it is lol.

 

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Anyone know where I can find a diagram?

 

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ok found a diagram anyone know if a dule coil driver can be bad on one side only?
i cant swap it unless i pull the coil plate

 

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Ok so Just to put a close to this .. We swapped the drivers today and yes that driver is bad. I have one ordered.