My alternator wire melted.

Mattax said
If its an isolated field alternator then there should be no continuity between either field terminal and ground.
If its a grounded field alternator then there should be continuity between the insulated terminal and the ground.
See if this info in this link helps Identifying Chrysler Alternators (1960-1976)
Both the how it should be, and how rebuilders screw with them.
Click to expand...

It's the square back which from every thing I have read the field should not be grounded luckily it just fried the blue wire to the point it splices into the other wires and didn't melt the bulkhead fitting