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Did you ever figure out your problem? I’m in the exact same situation.I've got twins with one of the two working right, I switched the harness at the helm and tried with he opposite key and it did the same thing so I figured the key was working. I do have the service manual and can do some of the test, but the ones requiring YDS or special cables that I don't own will probably have to go to a marina. I was hoping it was a common cure for this symptom, doesn't appear it is from web searches. Thanks a ton for the reply.