Fuses on a 1986 four winns.

[Michelemar]

How do you know what they are for and if they are bad. New to boating and no manual

 

[mike_i]

If something doesn't power up the fuse may be blown. If the fuses aren't labeled turn all of the accessories on then pull one fuse at a time and see what turns off then label it.

 

[Lou C]

Look on the four winns site, they used to list wiring diagrams for older models (Sport Boat)