Can you ID this alternator?

If there is voltage drop between the main splice and the ballast resistor, backprobe cavity N.
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PS. I agree the green field wire (R3) looks terrible. It may not be the immediate issue but fix it.

For repair, depending on what is damaged, you may find these threads useful:
Open barrel crimpers and Chryser terminals, wire strippers. Sources for Chrysler type wire terminals
Splice connectors and shrink tubing. Inline wiring splice clips........from the Dodge RAM service manual
Deoxit and other cleaning supplies. What do y'all use to clean the metal connectors that go into the bulkhead on either side of the fw?
Adhesive free harness tape in couple widths. Vendor needed for cloth / fabric tape non adhesive type