Amp Gauge Wire Diameter (AWG)

This is a 1980s jeep but provides an example of oxidized battery feed in the engine bay.
There was a small break in the wire insulation, and some greenish copper oxide could be seen.
Removed the molded insulation and slit the wire insulation open.
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That's not good. Current carrying capicity of that wire is reduced.

The fibre 'pen' and Deoxit can be used for cleaning.
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Can it be done repaired. Yes but it is difficult. I did it on the bench.
This one is Chrysler.
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Crimped and soldered. Crimping needs an open barrel crimper that can handle heavy terminals for 10 gage wire.
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Like I posted before, wire splicing is a bit easier.