Help Wrench! Etec keeps blowing fuse?

[BassMaster#1]

I have an 08 evenrude etec with about 92 hours on motor from my last report when i had in in for the 3 year service in march.  I just got back from pickwick lake when running the motor just died.  No power when trying to start and no power when trying to use tilt/trim on the motor.  Replaced the 10amp fuse in the motor, trim worked fine, but when i tried to start the motor fuse just blew again.  Been looking up causes today and thing are leading to new ECM or computer.  Ive had this motor for 5 years and just had my 3year service in march.  There is less than 100hours in motor and just want to make sure im not missing something before i take in to the shop.  Hoping FishWrench or any etecs owners  can shed some light on this issue?  Thanks

[snagged in outlet 3]

Helps to tag ole @fishinwrench otherwise he’s busy armchair quarterbacking biologists.  😂

[BassMaster#1]

18 minutes ago, snagged in outlet 3 said:

Helps to tag ole @fishinwrench otherwise he’s busy armchair quarterbacking biologists.  😂

Thanks, hope thus gets his attention

[Deadstream]

He is working now. Will get back about midnight. I always worked my best when the phone didn't ring. 

 

 

 

 

[fishinwrench]

It only blows the fuse when you try to start the motor, correct?   And it blows BEFORE the engine cranks over?

[fishinwrench]

Just now, Deadstream said:

He is working now. Will get back about midnight. I always worked my best when the phone didn't ring. 

 

 

 

 

Nah, I'm assisting the queen of Gumbo this evening.   

[BassMaster#1]

That is correct, when the fuse is blown i get no power to the motor at all.  No cranking over or no tilt trim.  As soon as install a new fush the trim will work.  When i crank the motor over it pops the fuse.    I took all electonics off the starting battery for a test and still popped the fuse.   Battery is almost at full charge.  

[fishinwrench]

Just turning the key to the ON position does not blow the fuse, right?  

It only blows when you try to crank the motor?     If so, then it is just a short to ground somewhere in the cranking circuit.  Somewhere between the key switch and the starter solenoid.   Don't let anyone sell you a new ECM !!!!

[BassMaster#1]

To diagnosis this should disconnet all the wiring harness them plug them in one by one to see what wiring harness will make it blow.  Then at that point trace the wires to see where the short is?  There is 3 harnesses on my motor?  

So i will want to open up the throttle housinv also to take a look at the wores where the key hole is to make sure all is good there also?

[fishinwrench]

I'm away from my wiring diagram right now, but I think the cranking circuit is the yellow/blk stripe wire.    

It's routing goes from the key switch, through the neutral safety switch (at the shift/throttle control box), then straight to the starter solenoid.   

Somewhere between the key switch and the solenoid that sumbitch is touching ground.    Now, the only question is....WHERE?