As a general rule fusible links should be replaced with fusible links. That being said I don't see any problems using a 15A fuse in place of the FL.5g. For the bigger ones though, I think it's just a good idea to stick with what Toyota intended. I still haven't had a need to replace a 2.0 link yet, but when it comes to fusible links the rule is to use a link 4 number sizes smaller than the wire it's protecting.

This means the 1st thing you'll need to do is determine the gauge of the white/blue wire. I can't recall what size this is but I'm thinking it's 6 ga wire. If it does turn out to be 6 gauge, then you will want a piece of 10 gauge fusible link wire to replace it with. If that wire is 8 gauge then you'll want a section of 12 gauge fusible link wire. Most auto parts stores like Napa will carry fusible link wire in bulk so I'd look for it there. To determine the gauge of the white/blue wire, when you cut/strip it, measure the diameter of the copper conductor and use the chart below. Tim