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For the most part there's little value in running without the headlight on. The alternator will generate a fixed amount of electrical energy depending on engine rpm and whatever isn't used by the lights, ignition, etc., will simply be lost at heat at the rectifier. Running without the headlight on will only mean that the rectifier has to handle the additional heat load and chances are that won't add to it's service life.
On the other hand, a low battery will charge better and if you're running electric clothes there will be more power for that, if the headlight is off.
If you have to have a switch to turn off the headlight connect it through the low beam hot wire. That way if you need lights in a hurry, say as a warning to someone who might pull out in front of you, all you will need to do is toggle on the high beam.
[ This message was edited by: Jimbonnie on 2007-05-31 11:44 ]
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