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Jim on Volvoadventures.com came up with this solution when stuck on the road with a blown 25A shorty fuse without any spares:

I have about 20 (hopefully a lifetime suppply) of those shorty fuses, so I never actually did this.
The way to narrow down the short is, disconnect all the wires (should be 2 or 3 wires) on the left side of Fuse #1, and plug them back in one at a time until the fuse blows. Once you isolate which wire is blowing the fuse, you will need to figure out which circuit it is. You will need to start to unplug each electrical system on that wire (or unplug all of them and plug them back in one at a time) at the source until the fuse stops blowing. Of course, this method involves using up alot of fuses.
Here's a site that list some of what is on Fuse#1 (hopefully, somebody can list all the equipment on #1 that is not on the fuse cover):
http://65brick.blogspot.com/2008/07/fuse-labels.html
Paul
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