This is driving me - the outside temp display will drop 10-20 degrees whenever I flip on the park and/or headlamps. I've cleaned 3 ground connectors (2 on drivers side front fender, 1 on pass. side front fender), all wire insulation looks intact (that I can see without tearing things apart). As long as the headlights aren't on, the temp display is accurate.

I've searched the forum with no luck, any suggestions?

Thanks,

Mike
1989 525i 214K