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Hello, my name is***** will assist you.
On the battery there is a fuse for the boat on the smaller red wire. Is that the one that you looked at?
If you have a battery switch, it may be jut after the switch.
Also on the dash area, look at all of the wiring under the dash to make sure that nothing has become unplugged.
The engines get their power from the larger leads that go from the battery to the engines. The boat gets its power from the smaller wire. Replace that 20A fuse on the small line and see if you can get power back.
Let me know what you find out on it. If that is not the cause, you will need a multimeter to troubleshoot further.