Regulator Fits CaterpillarOne New Aftermarket Replacement Voltage Regulator Fits Caterpillar (Fits CAT) Construction Equipment This aftermarket voltage regulator Fits Caterpillar (Fits CAT) OEM part numbers 3T6354 and 6N1874 and is designed for use with Fits Delco alternator systems (10SI, 20SI, 21SI, 22SI, 23SI, 26SI, 27SI, and related IR EF series alternators). The regulator maintains proper charging voltage across the electrical system, keeping the alternator output stable
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