Re: Generator Problems '45 Farmall A

Posted by John T on October 08, 2005 at 16:22:39 from (66.244.90.98):

In Reply to: Generator Problems '45 Farmall A posted by thynes on October 08, 2005 at 14:09:53:

Thynes, Ive not had all that much Farmall experience but I can tell ya this.

Your First question........

If that "device" you call a cutout relay has 3 terminals labeled BAT and GEN and FLD,,,,,,,,sounds to me like its a full fledged Voltage Regulator instead of only a 2 wire Cutout Relay.

A Cutout Relay has but 2 terminals, labeled BAT and GEN. On those systems, the Generators Field post wired up to the light switch where it received a dead ground for High Charge but was grounded through a resistor for Low Charge. They DO NOT HAVE ANY CONNECTION TO OR FOR THE GENERATORS FIELD POST.

On Voltage Regulator Systems, they Wired BAT to the ammeters load side,,,,,,,GEN (or ARM) to the Gens Armature post,,,,,and FLD on the VR wired to the Gens Field post AND NOT UP TO THE LIGHT SWITCH.

Its possile they got converted over the years from a cutout relay to a VR ?????? If you have a good working Gen and a good VR, I would use the VR instead of a light switch control !!!!!!!!! i.e. wire the 3 terminals as stated above for a VR, NO WIRES TO THE LIGHT SWITCH

A Cutout Relay has but one coil/relay,,,,,,,a VR has 2 or 3 coil/relays depending on if it has current and voltage regulation. Why dont you take a good look at the labels on the terminals on the device you have and its insides again???

Second Question

If there were load on the Generators and there was no voltage or current regulation, the voltage could and should continually increase as the Gen turned faster and even pop a 12 volt light.

Post back your findings and any questions

Let me know if you need my complete Troubleshooting Procedure for non charging.

Good Luck n God Bless

John T

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