12v 2 brush generator terminal identification

Andy Airgood · Oct 5, 2013

How can I identify which terminal is the field terminal vs the
armature terminal on a 12v 2 brush generator?

Carlyle hoffman · Oct 5, 2013

On DELCOS it is stamped on them. Like on a A-B JD the one toward the FAN SHAFT is the ARM.

Andy Airgood · Oct 5, 2013

Apparently it's not a Delco as nothing is stamped around the posts. On the inside I can tell one post has a heavy plastic insulator around where it goes through the shell of the generator and it does not attach directly to a brush. The other post does not have much of an insulator if any and attaches directly to a brush. Can you tell me from that description which post is the field and which is the armature?

Carlyle hoffman · Oct 5, 2013

Not me, some body else will have to.

D- · Oct 5, 2013

The post that does not go to a brush has a wire that goes to the field. Right?

Andy Airgood · Oct 5, 2013

Not sure what the field is. I tried to attach a photo.

D- · Oct 5, 2013

The fields are those windings attached to the housing. So that terminal that has a wire attached on the outside goes to the field thus making it the field terminal.

Andy Airgood · Oct 5, 2013

Got it. Thank you!

John T · Oct 5, 2013

On some the bigger of the two posts would be the ARM, smaller one FLD.

With the armature and brushes all in place, the one with higher resistance to case frame is FLD and lesser resistance is ARM.

The FLD post has but one wire, the end of the 2nd field windings. The ARM post has 2 wires, one to brush other to first field.

Got it???

John T

12v 2 brush generator terminal identification

Andy Airgood

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Carlyle hoffman

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Andy Airgood

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D-

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