Generators-Six or 12 Volt??

Pappy · Aug 23, 2018

It's easy to determine whether a coil is six or 12 volts, but I was wondering if anyone had any specs on a generator as to what ohms resistance would be between the "A" terminal and the "F" terminal. Trying to determine if it is six or twelve volt easily. One I am trying measures 3.9 ohm. Any ideas?

Steve@Advance · Aug 23, 2018

Never tried it, but found this.

Look on page 3.
Generator Info

rrlund · Aug 23, 2018

The rear of a 12v case,around the brushes,is smaller than the rest of the case. On a 6v,the diameter is the same the full length.

JMOR · Aug 23, 2018

(quoted from post at 11:09:07 08/23/18) It's easy to determine whether a coil is six or 12 volts, but I was wondering if anyone had any specs on a generator as to what ohms resistance would be between the "A" terminal and the "F" terminal. Trying to determine if it is six or twelve volt easily. One I am trying measures 3.9 ohm. Any ideas?

ualifying my remarks with I've seen a lot in over 70 years, but not everything.
Any car from 1940 to 1958 whether 6v or 12v have field resistance in a range of ~1.5 to 2.2 Ohms & 6v/12v overlap in Ohms, , so by that I say no simple determination. Ford tractors from 1939 thru 1952 (6v) fall at 1.3 to 4.5 Ohms, so same conclusion. A little skeptical of the 4.5 Ohms as it only shows up on two of eight different generators of those tractors. If it is a Delco-Remy, then 6V have a black tag and 12v have a red tag. Generator rebuilder my have more to say.

JMOR · Aug 23, 2018

(quoted from post at 11:53:31 08/23/18) The rear of a 12v case,around the brushes,is smaller than the rest of the case. On a 6v,the diameter is the same the full length.

ot universally true.

rrlund · Aug 23, 2018

I'm no expert on the subject and certainly wouldn't say you're wrong,but personally,I've never seen an exception. Maybe something other than a Delco?

JMOR · Aug 23, 2018

(quoted from post at 12:14:49 08/23/18) I'm no expert on the subject and certainly wouldn't say you're wrong,but personally,I've never seen an exception. Maybe something other than a Delco?

have one D_R that is straight/same size barrel end to end and the Ford hundred series tractors whether 6v or 12v are all same size too. I try? to be careful not to cast everything in terms of what I have experienced or seen, as whenever I have done that, I wind up being shown that I have not seen it all and find that generalizations I have made have almost always had exceptions. I'm simply human.

rrlund · Aug 23, 2018

Same here,that's why I asked if something besides Delco might be the exception and didn't dig in my heels. I've always found that in most cases,you can tell at a quick glance by using that generalization. There are exceptions to every rule.

old-9 · Aug 23, 2018

I cannot answer your question,but I had a generator ,from my Ford jubilee rebuilt to 12 volt to keep the stock look. I don't know if the rebuilder marked it 12 volt or not. joe

M-MAN · Aug 24, 2018

I asked my local rebuilder the same question years ago. His reply was there is no such thing as a 6 volt or 12 volt generator. Generators produce amps - not volts. Technically he's right but that doesn't help with looking at one and knowing which system it's used on.

Generators-Six or 12 Volt??

Pappy

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Steve@Advance

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rrlund

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JMOR

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JMOR

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rrlund

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JMOR

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rrlund

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old-9

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M-MAN

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