If it's alternator cabling it's only a short run anyway, to the solenoid block. How many amps are you drawing approximately? Big sound system? Original wiring? There is no earth as such on an alternator.. two +ve wires and one going off to the alternator warning light.
Test between the wire and ground also to see if there's any short which would be heating up the cable and causing the outer to melt..
_________________ tim
68 Deluxe 1293, HIF44, megajolt/EDIS4, daihatsu alternator..
'a mini is for life, not just for christmas!'
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