Auto-lite 3 brush generator

MNGB · Jan 29, 2010

Hi, I have a small auto-lite 6 volt generator that was apart when I got it, the field wire had broken off the field post/screw. I soldered the wire back on the screw connected the brushes and reassembled the generator, when I installed it on the engine and started it it started generating but at a high idle it is putting out more than 10 amps and at half throttle it is at 20+ amps this is a 13 amp generator. Adjusting the sliding brush has no effect my question is could I have the brushes connected wrong? I have the wire that goes from the brush to the cutout connect to the sliding brush and the field wire connected to the other brush this looked like the way the wires came off but like I said it was apart when I got it. Any help will be appreciated.
GB in MN

JMOR · Jan 29, 2010

(quoted from post at 23:04:45 01/29/10) Hi, I have a small auto-lite 6 volt generator that was apart when I got it, the field wire had broken off the field post/screw. I soldered the wire back on the screw connected the brushes and reassembled the generator, when I installed it on the engine and started it it started generating but at a high idle it is putting out more than 10 amps and at half throttle it is at 20+ amps this is a 13 amp generator. Adjusting the sliding brush has no effect my question is could I have the brushes connected wrong? I have the wire that goes from the brush to the cutout connect to the sliding brush and the field wire connected to the other brush this looked like the way the wires came off but like I said it was apart when I got it. Any help will be appreciated.
GB in MN

I do not know what exact generator that you have, but I know 3 brush generators that came on Farmalls & Fords and you do not have your wired like they do. They are wired with the 3rd brush supplying the field, which to me makes sense, since that allows for an adjustable field current & thus an adjustable generator (armature) output. I would venture that you have it wired wrong. Back "in the day" as they say, Autolite was Ford's electric stuff. See lower right in dwg.

MNGB · Jan 29, 2010

Hi JMOR, thanks thats what I was thinking tomorrow I'll switch the wires and see what happens. The generator is an Auto-lite GAS 4169A as used on the Earthmaster Tractor.
Thanks for the diagrams
GB in MN

John T · Jan 30, 2010

Great pics by JMOR. NOTE Many of the older Fords used a "Class B" Charging systems unlike Deere and IHC and Ollie etc that used a "Class A" and either type, of course, requires the correct matching A or B Voltage Regulator. On the A you regulate the charge by adding or removing resistance prior to the Fields going to ground while on the B youre regulating the input voltage to the Fields.

John T

MNGB · Jan 30, 2010

Good Morning, thanks much JMOR, I switched the wires on the brushes and the generator is working like its suppose to.
GB in MN

JMOR · Jan 30, 2010

(quoted from post at 14:28:33 01/30/10) Good Morning, thanks much JMOR, I switched the wires on the brushes and the generator is working like its suppose to.
GB in MN

ou are quite welcome. Glad I could be of help.

Auto-lite 3 brush generator

MNGB

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JMOR

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MNGB

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John T

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MNGB

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JMOR

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