SOURCE: Fog Lights won't work
Definitely a ground. Clean everything with light sandpaper. Follow any/all wires and see where it grounds, clean there too. If all else fails, run a new ground wire from the frame to the exact spot you got the bulbs to work (a workaround that usually remains permanent on my cars!).
SOURCE: 98 Jeep Cherokee Fog lights
It's definitely the switch...I bought two of 'em so far...known bug. I don't use the fog lights as much anymore , but the "Airtex" oem equivalent switch from Rockauto seems to be holding up well. If you dissamble your broke switch you'll probably see evidence that it is beginning to melt and theres alot, maybe too much, grease, which may or may not have been the cause of the bad, heating contacts inside switch.
If I remember right, even though the foglights have a relay there is still full amperage going through the switch or something....don't qoute me on that last statement.
SOURCE: Need Fuse Map Diagram BMW 318i 1993
check the internet for a bmw e36 ETM ( electronic troubleshooting manual) everything you need is there.
SOURCE: renault grand espace phase 3 fog lights wont work
Broken wire at the stalk should be white remove the covers
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