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Ford 9N, 2N & 8N Discussion Forum

Generator Question

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John-Mi

03-21-2005 06:29:07

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Went to local auto electrical shop to pick up a new voltage regulator. The man said he would need to know if it was an A or B circuit. How do i tell the difference. Thanks.

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Rob

03-21-2005 07:32:49

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Front-mount distributor should be 8N-10505B in reply to John-Mi, 03-21-2005 06:29:07

B-circuit. Side-mount should be 8N-10505C A-circuit. That"s the way Just-8N"s sells them.

Having said that, both my front- and side-mount are are A-circuit.

The A-circuit regulator has a wire-wound resister riveted on the back-side going from the FLD to ground. A B-circuit regulator would need that resister going from FLD to ARM.

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Rob

03-21-2005 11:53:33

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Jim Cox is hard at work but says Hi! to everyone. in reply to Rob, 03-21-2005 07:32:49

I"ve been picking his brain on regulator issues.

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souNdguy

03-21-2005 06:46:18

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Re: Generator Question in reply to John-Mi, 03-21-2005 06:29:07

Here's the easy way.. check by application? You got an 8n? It's A-circuit,

You got a NAA or higher? - It's a B circuit.

Here's the hard way, if you have a genny in hand.. and no idea of application.... pull it apart and see how the field shoe is hooked up.

A- circuit gennies use a field that is internally hot, and then the other end of the field coil goes out to the regulator to allow the regulators bias resistor and vibrating contacts to apply ground to the internally hot field.

B circuit has an internally grounded field, and the other end of the field coil goes to the regulator for field power via the vibrating field contacts.

The 3rd brush gennies like our 9n/2n used were pretty much b-circuit.. as the field was powered by the 3rd brush, and internally grounded. etc.

That help any?

Soundguy

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