I found a couple of lists of all the fuses and their locations. I noticed the tailgate wiper is listed twice. A 10amp fuse (Number10) in the engine compartment and also a 15amp fuse (No12) in the rear cargo area. Not sure if this is a mistake as I can not see a fuse for the tailgate washer, and I would expect a 10A fuse to blow before a 15A. I blew the 15A fuse in the cargo area twice, but did not need to replace any fuses in the engine compartment.
This link is for 2001 Volvo V70 but should be the same for 2004.
http://new.volvocars.com/ownersdocs/..._08a.htm#pg108
Another link lists 2000-2004 and also 2005-2007 fuse locations.
http://www.volvohowto.com/volvo-v70x...-and-amperage/