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Diesel Engine Parts Qsb6.7 4923977 5301509 Injector Wiring Harness for Heavy Duty Truck Electronic Control Module Wire Assembly. The 5301509 is a genuine OEM fuel injector wiring harness engineered exclusively for ISDE and QSB6.7 6.7L diesel engines. Manufactured with high-temperature resistant insulation, color-coded copper wiring, and waterproof sealed connectors. the 5301509 wiring harness resists engine bay heat, vibration, moisture, dust, and chemical corrosion.