AWM on the insulation is probably marine grade.
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Note that any exposed conductor, even the tinned wire, oxidizes over time. Strip and crimp it! If it shows some oxidation, cut it back if there is room or clean it before crimping. Sometimes conductor will have corrossion back under the insulation. :( Then its usually worth cutting out and replacing. That's why that brown wire is sitting on the bench. IIRC its from a front turn signal connector on my Jeep.
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