Posted by k1r2 on April 12, 2016 at 17:48:18 from (107.217.87.29):
Hello all, I have what I believe to be a Delco-Remy generator on my TO-20. The thing wasn't charging, turned out to be the voltage regulator field points were not grounding the field coils.
But, while I was at it, I got into the generator, which is a three brush generator, circuit A type. I dug up as many specs as I could find, according to them, the field coil is separated from the armature.
With a DMM I measured the resistance from the field post on the gen. to the armature brush on the commutator, expecting that if I did see some current flow, all I would have to do is raise the field brush and break the circuit.
Well, I did, and it didn't... :?
There was an increase in the ohms when I lifted the field brush, but still there was a connection between the field post and the armature brush. btw, there was around 7 ohms with the field brush connected to the commutator, and about 10 ohms when I lifted the field brush.
Now, this sounds like the field coil is close to shorted, and the voltage would run high. But the thing works....
Low RPMs the charging relay will not even close in the voltage regulator, medium RPMs, 14.0 volts, full throttle 16 volts output from the generator.
So, my question:
Is the field coil on some of these generators connected in some manner to the armature without going through the brushes?
Since it is working, and has been for years, should I leave it alone, employing the "if it ain't broke, don't fix it" strategy?
btw, I've looked the generator over, there are no numbers on it at all. But, I think it is a Delco.
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