Whenever I'm in the automatic mode using the climate control, and the fan goes up to high, both my headlights and cockpit lights brighten, it's nothing dramatic, but certainly noticeable. I tried to reenact by manually placing the fan switch to high, but my lights didn't brighten. Then I tried to vary engine rpm to see if that had anything to do with it, nope. Is this a sign of something starting to fail? On a similar note, my climate control fan operates intermittently, when it works it works, when it doesn't, it takes a while for it to decide to come on, and that's both in manual and automatic. I read somewhere that it could be linked to my ignition switch? any ideas? Car is an 84 380SE, Thanks again for everyone's help.

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2012 550CLS
1982 380SL
1985 300D
1998 ML-320
1997 E-320
1984 380SE