Need help with fuse that keeps blowing

Forgot to add, there is ONE MORE troublesome cause of fuses blowing, especially with the older cartridge fuses in these cars. If you get a fuseholder where the clip is loose, rusty, or in some fuseholders, the electrical connection becomes loose (riveted) to the fuse clip,

THIS GENERATES HEAT

And that heat melts the solder in the cap of the fuse, "blowing" the fuse.