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Some recent messages about alternator brush replacement caused me to 
monitor my car's "operating voltage" via channel 11 on the climate control 
system readout.  It's generally runs about 13.2 - 13.3 at 30mph+, whether 
or not the lights and a/c are on.  Highest I've seen is 13.7 first thing in 
the morning, and it occasionally dips to 12.8-12.9 for unknown reasons 
(slipping belt?).  Sound normal, or too low?

John Winkelman