JE> Roy I would reckon it depends upon the car. My kids late model Suburbans
  > both act as my cars did. However, if you get into the smaller cars they
  > may well not have enough Alternator to do the job under idling
  > conditions.

A friend of mine bought a new Honda CRX in 1989. Its idle speed would 
change depending on electrical load. It was especially noticeable when 
listening to music while sitting in the driveway. The engine would rev 
a little higher in response to loud and/or bass heavy passages, then 
settle back down during softer ones. The stereo system he put in it was 
beefier than the factory one, but not a monster. The car has held up 
remarkably well over the years. He still drives it.

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