What fuses?

[Gramas]

Looking to buy 12way blade fuse box with x2 positive &1 neg terminal.
Basically looking for guidance on what size fuses I'd need for a garmin 550gps , VHF, nav lights, work/deck light & basic compass?

[Nos4r2]

Depends on the draw of the units. I'd go 5a on the GPS, wire the compass to the nav lights and use a 10a,use a 10a on VHF and 25a if you're using a 55w searchlight or floodlight.

I know what I've said isn't exact and they're a bit higher rating than needed. However, it's enough you won't have a wiring fire unless your wiring is hair thin and if you're blowing fuses anyway, the unit is already not working.

[Gramas]

Cool cheers for swift reply, just want to make good neat/safe job, doing the rib up, old wiring was shocking, no doubt there will be more advice posts soon as I progress haha

[j.i.wilson]

Just as important is to match the size of the wire to the size of the fuse.

It is essential that the wire is able to carry more current than the fuse.

Always use tinned wire. Always use crimped connectors. Use heat shrink wth adhesive built in.

[doggypaddle]

The fuses are only to potect the wiring. size the fuses no more than the wire capacity. The radio GPS etc will have their own internal fuses to protect them, so if theyre the only items on a circuit you can size the main fuses the same or slightly larger, even if they the same size, for example 2 amp in the GPS, and 2 amp in the fuse box, If there is a GPS fault the fuse in the GPS will go first as it will be a faster fuse. The automotive type blades are fairly slow blow and will carry double thiir rated current for a short time before they blow.