Posted by Janicholson on August 12, 2019 at 06:35:35 from (24.240.46.228):
In Reply to: Re: cut out relay posted by gotmyfarm! on August 12, 2019 at 05:07:37:
As bob noted the Field terminal on the generator is connected to the light switch for controlling the output for charging. The light switch is divided into 2 switches internally. One is a power switch to the lights, and the other is a switched ground used for the generator. They both work using the same shaft, but have no electrical connection. The field in the Delco charging system is provided voltage inside the generator, and grounded to make it have magnetism. The grounding is through the light switch at two different rates, One for Low charge through a resistor on the back of the switch, and a high charge rate directly to ground. The high charge rate happens when the light switch is in H D or B positions. This is to allow the battery to be charged at about 10 amps to makeup for multiple starts in one day, or when the lights are on Dim or Bright. There is no Off position for the generator because the cutout relay in the box on the generator turns the entire charging system on and off as the tractor is running or shut off. Remember the tractor was designed to run pulling implements or running a machine like a feed grinder for hours. This means the generator (as designed) doesn't work well, or at all, when idling around at low engine speeds. Common issues with the system are bad cutout relay, bad light switch or light switch ground, and bad brushes in the generator.
Were it mine, and if I was more interested in function and reliability than originality, I would change it to 12v negative ground, with a Hitachi made 14231 alternator. (fits 1977 Nissan PU) The Hitachi is smaller and is easier to fit. It L terminal is equal to a Delco 10SI #1 terminal, and the S terminal is Equal to the #2 terminal on a Delco 10SI. It is necessary to put a resistor in the coil circuit (or a coil designed for use with no resistor. Change the wiring on the coil so the negative small terminal goes to the distributor, and change out the light bulbs to 12v. The starter can handle the change as is.
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