TO-20 Electrical Problems 1948

Hint.. flip the reg over... look at the bias resistor(s) underneath to determine circuit type.

A circuit:

Bias resistor from ground tab to FLD tab.

B circuit:

Bias resistor from ARM/GEN tab to FLD tab.. may have another bias resistor.

Now.. once you determine the field type...

Motor test your genny.

slip belt off genny, disconnect ALL wires.

hook arm/gen to bat Hot.

If it is A circuit, then ground the Fld post.

If it is B circuit, lump hot to FLD as well.

Most gennies that motor, will charge.. most gennies that charge.. will motor.

If it is A- circuit, you can put it back together and leave F wire off and then start up tractor, grounding F post on Genny will make max charge.

If it is B circuit, leave F wire off, but jumper F post to bat hot and it should make max charge.

If still nothing at battery.. jumper arm to bat across the regulator.. it may have a bad cutout.. repeat full field test for circuit type.

post back if you have questions.. if you know circuit type.. post it.. makes diagnostics easier..

soundguy

I have tried to polorize the generator it did not work or help. I have rewired everything and still have nothing. Is it possible that my generator is not spinning fast enough to generate what i need? If i should try to go back to a 6 volt system would this be easier or should i upgrade to a alternator. the only alternator kit i have found is for a TO 30 and say if i make a bracket for it it will work. i am getting really tired of staring at this tractor and trying to will it to work. any help will help.