Don't know if this will help you or not but it was all I could find on the web so far.
"Should not be any fuses except for your electronics. Those will be found in the positive lead of the power cable to the device. The boat will have a breaker panel under the driver console."
Like I said, I found it on the web so I can't vouch for the truth/reliability of the information but it might be a place to start?