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Lou,
This could be caused by a few things. You don't have to have a broken wire to have a short and if they worked for a while before blowing the fuses it may be intermittent and difficult to find. Take an ohm meter and first measure the resistance of your fan motors to be sure they haven't gone up. Then hook it to your lead to the fans and open the fuse so you will only be checking that lead or leads if you have two of them. There should be no reading. If you get one you have a short somewhere in the lead. If you don't get one start following the lead and moving it and watch the meter and see if you see it suddenly read and drop or the reading stays steady. If you get this then you are close to the place the short is.
Ron
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