Two things here. Polarizing the generator like another poster pointed out. Ford normally did things opposite of everyone else years ago. Just the way it was. So be certain you are polarizing correctly.
Second thing is, when regulator quits working, what do the points look like. Are they burned blue, just pitted excessively or are some windings blackened from over heating.
I well know most new regulators are junk but it is usually due to poor material in points. Years ago, the positive point was a different material from the negative point. Now day, they make them to use on either pos or neg ground so material is same on both points. Can't change that of course. But, on the other hand, a lot of generators are mismatched so excessive field current is flowing through the points and no point will last if that is the case. Lot of generators that are rebuilt have field coils passing too much current. They again are universal, work for all . Problem is they don't. An old system that had a high low charge setting on the light switch for example, flowed considerable more field current than fields made for vibrating voltage regulation.
I would check field current flow through known good dependable generator compared to this troublesome one if I was working on it.
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