Posted by mkirsch on April 21, 2014 at 05:20:23 from (65.199.189.6):
In Reply to: Amps and volts posted by Notjustair on April 20, 2014 at 18:08:30:
A Voltmeter is every bit as useful as an Ammeter in monitoring and troubleshooting an electrical system, if you understand the relationship.
In a nutshell:
More Volts = More Amps
Less Volts = Less Amps
14-15V tells you that the system is producing a normal amount of current to power the tractor's electrical system and charge the battery.
It can go above 15V if the battery is really dead, but if it pegs the needle, the regulator isn't working and you'd better shut down ASAP to avoid boiling the battery dry.
When you see <13V, the alternator isn't charging properly either, and needs help soon, before the battery dies.
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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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