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Old 05-31-2020, 09:01 AM   #1
37 Cab
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Default Generator question

My 37 is still 6 volt positive ground but has a voltage regulator not a cut out. It quit charging. I jumped the battery to the field terminal on the regulator and still no output from the generator. I did check for voltage to the regulator. My question is, Which 2 brush generator do I need? My fan is mounted to the generator pulley and I realize I will have to use my pulley but want to get the right generator. Are 40 and later 6V generators all the same? Not much luck searching for parts to rebuild. Anyone have one?
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Old 05-31-2020, 09:27 AM   #2
fortyfords
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Default Re: Generator question

40 and up generators have screw on pully's, earlier generators have a key way. But a 39 standard has a screw on pulley so you can use a fan mounted pulley on those later two brush generators.
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Old 05-31-2020, 09:37 AM   #3
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Default Re: Generator question

Thank you. I will pull mine off today to make sure it is not keyed.
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Old 05-31-2020, 11:37 AM   #4
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Default Re: Generator question

Looks like I am in luck this time. Found a broken brush spring. Ordered new ones from Macs. Probably china made but I ordered a spare. From your post can I assume my 2 brush generator is for a 39 standard only? My pulley is keyed.
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Old 05-31-2020, 07:11 PM   #5
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Default Re: Generator question

To test the generator you do not jump the field to the battery terminal at the regulator. Remove the field wire off its regulator terminal and connect it over to the armature terminal. Then rev engine up to about 2000 RPM and generator should charge up high if it is any good. Regulator cut out is still in circuit for this test. If the generator charges then the regulator is most likely at fault. Regards, Kevin.
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Old 05-31-2020, 09:33 PM   #6
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Thanks Koates. I was cornfused.
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