NH fuses are available with a red indicator dot that pops off when they melt. Yours do not have it, so you can tell they triggered when the boat is dark or the windlass not working

It should be easy enough to follow the cables to see which does what - on ours the 100A is for the windlass, 125A for house bank. Get a white marker pen or some labels and start marking the cables - it'll be helpful later!