I had same problem in my 1995 saab900,
the fog light contains a bulb and two cables (ground and hot).
the ground cable connects to the bulb base by a connector, this connector collects salt because of the high current and humidity I guess, which made inconductive.
Just cutting the connector and solder the cable directly to the bulb base solved the problem.
the schema is like that:
1- foglight switch give low current to a relay under the hood.
in the same time the switch will get current from the normal ligth so it wont work untill you put the lights on.
2- the current goes from to the relay makes the relay connects the fuse current (from battery via fuse) to the ligts directly.
so the connection is straight forward.
the components involved are:
1- fog light switch.
2- fuse inside the car on the left side of the stearing wheel.
3- fuse under the hood to the top right side of the engine if you look at it from the car front.
4- in the same fuse box under the hood there is a samll relay.
5- cables takes the current from the relay to the foglights.
6- the fog lights have a connection at the back, and connection inside.
make sure you measure each points with a multimeter and in doubt make temporary cables like ground directly to the battery to make sure you don't miss anything.
good luck and email me if you still have problem
[email protected]
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