Turning on your headlamps, while seemingly insignificant, does add a very significant load on the alternator which will normally show up in lower idle rpms.
Today, we are so spoiled with our modern fuel injected cars that automatically compensate for this as soon as they sense the slightest variation in idle rpm with their computer controlled idle air control valves, that we hardly notice a change in rpm, even if we turn on the lights or if the A/C happens to cycle on and off.
I think you might be chasing your tail on this one...
Cheers,
Joe Garcia
[This message has been edited by stlrj (edited 03-20-2001).]
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