Re: Farmall A Generator Question

Posted by Haas on March 15, 2004 at 06:17:29 from (12.65.78.97):

In Reply to: Farmall A Generator Question posted by Maurie (MI) on March 15, 2004 at 04:47:29:

If you have been running negative ground and switch back to Positive, you will have to repolarize the generator. If your A is original, there is no voltage regulator, only a cutout relay to keep the battery from discharging through the generator when the engine is not running. Charging rate is controlled by the 4 position switch. In high charge postiong (around 10 amps), the field coil of the generator is grounded for max charge rate. The max charge rate is set by adjusting the third brush in the generator. In the low charge position, the field coil is grounded through the resistor on the four position switch, giving a lower charge rate of about 5 amps. There should be markings on the generator terminals of "F" for field and "A" or "G" for the generator output. These markings should be stamped into the metal of the generator housing near the terminals on the generator. I would suggest that if you have the cut out relay, to replace it with a regulator. You can get a regulator with the mounting bracket to mount on the generator just like the cutout relay. It will look just like the cutout and no one will know the difference but you and you will have a much more dependable system with better battery life. If you do that, you won't need the resistor on the 4 position switch and the switch will become just a switch for the lights. I should also point out that if you have lights, there are two resistors on the switch. One is for the dim position on the lights and the other for the charge rate.

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