"I think next I'll do the "motor" test on the generator. From what I'm reading, if I can run the generator as a motor it should charge."
ACTUALLY, its my opinion that its ONLY if it passes BOTH Motor Tests (see my Troubleshooting Procedure below) it should charge. The first shows if the armature and brushes are good while the second shows the field windings condition.
"What about the cut-out relay? I see various posts about VR's, how does one go about testing the cut-out relay?"
If the cutout relay is working (a VR also has a cutout relay inside it remember) when the tractor isn't running there would be hot battery voltage on the BAT terminal but none on the GEN/ARM terminal (unless its stuck closed). Then once running iffffffffff the genny and all else is wired correct and working, the normally open relay closes so theres voltage on BOTH the BAT and GEN/ARM terminals, but once shut down the relay if working should open.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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