Most regulators are (or were when new) labeled to indicate voltage. They were also labeled for polarity, if it mattered. The marking may be stamped in or printed on. It is usually on one of the mounting brackets or somewhere on the bottom side. Most Delcos have it stamped into one of the mounting brackets. There will be some combination or 6 or 12, maybe a V and maybe a P or N. Maybe be POS or NEG. Might say "P 6V" or simply "12N".
There is a troubleshooting procedure on a web page. I don't have the pointer handy, but somebody usually posts it on any charging problem thread. I would expect a 6-volt regulator to test as "bad" if mounted on a 12-volt system.
One quick test is to directly ground the generator "F" terminal. Check voltage at the "A" terminal. This bypasses all the regulating function of the regulator and should put the generator at full output. Check voltage at the "A" terminal. If this voltage is above what you measure at the battery, the regulator is bad.
I am assuming you have good grounds everywhere, including the generator shell and the regulator.
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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