I rewired my OEM fog lights on my '98 C70 according to a diagram posted here. This allows the fog lights to be on separate from the headlights and DRL's.

The problem is that there is 'pop' sound which is heard through the speakers whenever the fog light dash switch is turned on, then off. The louder volume, the louder the 'pop' sound.

The wiring is connected to the blue/yellow wire at the headlight switch wiring harness and the brown/pink from the dash fog light switch. All to a newly mounted relay under the hood.

The lights work great, except for the 'pop' sound.

Any ideas or help from anyone?

Thanks in advance.

Butchman.