An alternator will charge at lower speed than a generator, but still it has it's limits. Also depends on the size of the pulley. Some have a large pulley, they require a little faster engine speed to make full power. They also need to be revved quite high to get the initial charge going, then can be slowed and still charge.
I would recommend watching your gauge/light/voltmeter, whatever it has to indicate charge. You'll learn it's normal operating characteristics, it will become second nature to you to glance at it to see if it's charging. Also try running the engine a little faster. The extra fuel consumption will be minimal. It is also easier on an engine to have the RPM up a little, they oil better, build less carbon deposits.
Finally, avoid stopping and restarting as much. Restarting takes a toll on the starter and flywheel gear. Starters are expensive! Lets not even think of what it involves to change the flywheel gear!!!
No matter how well the charging system works, it's a matter of letting it run long enough between restarts to put more in the battery than the starter just took out. Restarting instantly takes power from the battery. Replacing the power is a gradual process.
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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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