The jpg from the FSMs are hard to read due to the way FABO reduced the image. But there's no fusible link shown.
Some ammeter's are more robust than others. If the sparks flew from the ammeter's battery post, then no current when through the meter. If the sparks flew from the other side, then it could have been damaged. But like Redfish said, there's no way to guess that. The ones that fail usually do so 'cause they got hot enough the plastic distorted allowing the connections to loosen. Yours might not even be made of plastic.
Anyway here's my current interpretation of the '62 main circuit.
There should be no break in the these wires.
In other words when the battery is hooked up these should be at battery voltage.
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