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Wire gauge (awg) for a 130-amp alternator will vary according to voltage and length. A 12 volt, 100 to 150 amp alternator requires 4 awg for less than five feet, 2 awg for five to ten feet, 0 awg for 10 to 15 feet, 2/0 awg for 15 to 25 feet and 3/0 awg for 25 to 30 feet.
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