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Blown fuse means the circuit it protects is shorted to ground before the electrical load.
If you don't mind blowing a couple more fuses, the easiest way to trace this particular short is by process of elimination. First, remove the fog lamp relay; then put a good fuse in and try the headlights. If both lights work and fuse doesn't blow, the short is either internal to the fog lamp relay, or somewhere in the control side of that relay (wiring, fog lamp switch). If fuse still blows with the fog lamp relay unplugged, disconnect the fog lamp switch and try it again. If the fuse still blows, then you'll have to trace the Blue/White wire from the fuse in the main fuse box until the short is found.
Some shops will actually disconnect all the loads, then use an Ohmmeter to check continuity to ground from connector to connector; they'll start cutting wires to make the circuit "smaller" until the short is found.
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