My fog lights are acting foggy, Like fog, my fog lights don't come on until they get warm. ??? Options

[tumamilhem]

Anybody have this issue or know how to correct it?

My fog lights do come on. However, I have to drive for about 5-10 minutes before they come on. It's like something has to heat up the connection before they will come on.

I thought there may be a bad wire connection. But if that were the case, they would come on intermittently and at random (when I first start the car, maybe go off at some point, etc.). But they always do come on and stay on, just after the car warms up.

Any idea why this is happening?

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[Mike Bellis]

Most likely the lamp sockets and terminals are corroded. This is commonly called an intermittent open circuit. Bumps and vibration can break through the corrosion just enough to complete the circuit. Sometimes, leaving the power on can "cook" through the corrosion forming a carbon trace that will conduct. This would explain why they will turn on after time has passed. Carbon tracks are most common inside the distributor cap, causing ignition misfires.