Join Date: Feb 2002
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Re: headlights on idle up?
I don't know if this will be of any use, but I know carb'ed samis have an idle-up feature on the carb that increases the idle speed any time one of three accessories (lights, fan, rear defroster) are turned on, to counteract the alternator load and try to keep the charge rate net positive. My Honda Civic has the same and it's EFI. It sounds like your beast is doing the same.
Look in the wiring diagram for a point where all the major electrical loads meet at one point, after passing through diodes. This is the other big reason why you adjust idle speed with the loads off, I figure.
For what it's worth,