Posted by wore out on February 28, 2022 at 21:21:35 from (64.255.159.199):
In Reply to: Cub generator posted by grandpa Love on February 28, 2022 at 17:39:54:
[quote="CVPost-grandpa Love"]
I'm NOT sure why I am taking the time to type this as you likely won't read it through, much less install the generator as I suggest, and give it a try, by here goes...
That specific cutout is rather unique in that it has a field resistor inside similar to the field resistors found on some light switches.
The way the setup is wired NOW is correct for a tractor without a light switch, the "F" terminal on the generator is connected to the "F" terminal on the cutout, making use of the internal field resistor.
(Note the diagram posted by Rodney shows the "F" terminal on the cutout UNUSED, as the light switch is present and it's resistor is used INSTEAD of the one in the cutout.)
All you need to do is connect the BATT terminal on the cutout (the one with nothing currently connected to it) to the tractor's Ammeter and on to the battery and (if the generator and cutout are functional) it will charge at a low rate, just fine for a tractor with no lights.
Polarize the generator BEFORE startup by momentarily jumpering the BATT and ARM terminals on the cutout.
This is a "third brush generator" and the charging rate (with the field resistor in the circuit) is fine-tuned by the position of the third brush.
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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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