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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?