There are two fuses involved in the fog lights. One supplies the control side of the relay. The other powers the fog lights. Which one is burning out?
If its the fuse that powers the fog lights, check:
1) Current drawn by the fog lights with the current rating of the fuse e.g. have you overloaded the fuse.
2) look for caught wires, nicked wires and shorts.
if the fog lights need more current than factory lights is it ok to put a larger fuse in
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