Like said, voltage regulators are temperature compensated. Some are very active, some are not. Some read battery temperature through a sensor under the battery , most don't. Some regulators for continuous use like farm tractors running for many hours full bore have a lower set point to reduce overcharging. When IH started using the lower voltage regulators , most thought the alternator was defective. That being said, normally when checking for full rated output of a alternator, you load the battery until it drops to 13 volts and at that voltage the alternator should be capable of turning out it's rated amperage, like 100 amps for a l00 amp alternator or within 90 percent of that. So, you can see , that voltage will normally drop some when using a lot of current.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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