My engine wiring harness burned up a couple wires yesterday!

I would do some quick/ dirty testing. Alternator may not be hurt, unless it suffered fire/ flame.

Check continuity of the field. Ohmeter connected to the two field terminals should be a very low reading. With one lead of the meter to the case, either field should show open.

With some alligator jumpers, ground one / either field, and jumper power to the remaining. This should cause the alternator to charge full output, if the output wire is still hooked to the battery. Check for breaker/ fuse/ fuse links, etc