loose wires

No Dan. He's talking about the R6 and A1 wires that have an captive (forked) spade or ring terminal that is clamped to the connector terminal.

You can see that here.
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The spade (some call it a buss bar) going through the connector is loose, then you will want to secure it.
The more it moves around, the more chance of breaking wire strands in the crimps.

Its could be loose because it was physically hit, or because it saw a lot of current and the plastic was damaged from the heat. High currents come from events like recharging a dead battery with the alternator and such.
Another reason it could have become hot would be a poor connection either at the clamped terminal or inside at the wire crimp.

Here is an example where one was damaged.
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If you go to that thread, you'll see on that car, the ammeter also was damaged by overheating.
Anyone Know What this Connector is Called?

That could have been from years of use with a loose connection, excessively high charging rate and ignoring the ammeter needle, or a short to ground.