Re: Electric fan keeps blowing fuse.
So take the cycling factor out of the picture, the fans are rated start-run-stop repeatedly with a 25a fuse. This 25a fuse is melting the solder out of the ends, and you distinguished a burn smell. The fan/fuse circuit was electrically budgeted properly I assume from the manufacturer.
One, or both, fans are defective. Once the fan heats up it draws more current. The burning smell could be the motor windings (laminate) wire burning and then shorting against itself = more current draw. That equates to fewer windings, less resistance, more current draw.
Another scenario is the fuse holder does not make solid contact against fuse causing a heated/arching connection which will melt solder.
1969 RS/SS Vert
1031 Engineering llc