Est Open Faults on Mercury 600 sci
 

We were idling today and the port motor shut off and won’t restart. The code that comes up is est 1 open est2 open est3 open all the way to est 8. Any suggestions? My first guess would be the computer?

I'd look at the fuses then the plug that connects coils to the computer.

Update: I installed a spare computer and it’s showing the same codes, no difference. Any additional suggestions ? It does have whipple stage 2 upgrades.