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You say you have checked everthing and now assume its an earth fault.
How have you checked everthing?
Not wishing to sound too much like telling grandmother how to suck eggs but, have you checked for a live feed to the lamps? Should have 12v+ with enging running. Also check to see if the voltage disappears when connected.
Have you checked the resistance of the bulb?
Have you done a continuity test from the fog light earth wire to the battery?
Let me know what you have checked and the process you used. If possible include the reading you have.
Although it sounds a bit iffy, check the bulbs. Look carefully at the fillement inside the bulb to make sure it is connected at both ends. Funny old game but if one bulb fails, the other one can as well, just one of those quirky electrical thingies!
Its generally ALWAYS the bulbs that fail! Take a closer look.
I am have got exactly the same problem on my 172 so would any/all of the above apply to me??? as not really electrically minded when it comes to things like this