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Do you have a voltmeter or a 12 volt test light?
If that 120A fuse is blown it should be obvious bu to be sure it's best to check voltage directly at the fuse.
when turning the key on do any lights on the dash turn on?
Is this a Honda Odyssey?
Ok, it seems it lost all power from the battery, just get a simple 12 volt test light it should do for now, you can get them at any hardware store or Lowe's and Home depot as well.