9L7309 Regulator Fits CaterpillarOne New Aftermarket Replacement External Voltage Regulator Fits Caterpillar (Fits CAT) Equipment This 12 volt solid state external voltage regulator Fits Caterpillar OEM part numbers 9L7309 and 9L7648. It is designed for use with Fits Delco Remy 10DN and 20DN series alternators on negative ground charging systems, maintaining a 14. 2V set point to keep the electrical system operating within spec. This is a widely interchanged regulator used across
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