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Best thing to do is go to Argo adventure website. Look up magnum manuals and download the m18-m20 engine manual. The electrical section is very detailed with drawings as to what leads to test. The previous posts here cover most of it but the diagrams will help a bunch. I've seen people spend hundreds of dollars on unnecessary parts by jumping in without testing. Good luck.
Maybe someone can help identify what it should have from old specifications but I have to see them to tell the difference. If your readings come into either set of specs that will tell you what stator coil is in it. If stator is bad they arnt usually close at all. Just a test lite on the center terminal of rectifier will tell if you have battery voltage or not. Has to have it to work. Good luck figuring it out with out spending a pile of cash.
Don't connect them together. Probe them but don't connect them.
(ignoring anything to do with rectifier)
First check resistance as described in post #8. If that's good then check the output voltage as described in post #5.
If this has passed then your stator is working. Now go back and test the rectifier (same posts but now ignore the stator stuff).
I also looked at the magnum manual on battery not charging. It said something like the volts should be 13.8 to 14.7 and when you put a load on (tuen lights on or anything that creates a load) the system the colts should go up. If not your charging system is done? Seem correct or?