Rrrrrrr, need help on this one.

For testing purposes I would get a low amperage fuse like 5 amps. Do not try starting the car but it will give you enough current flow to trouble shoot.

Also a fusable link is more like a slow blow fuse, so it is possible that the 30 or 40 amp fuse is just blowing too fast.

All that being said you need to get your cars wiring diagram so you can start tracing out your wires