Cummins 3921789 Engine Wiring Harness - Used

Cummins engine wiring harness, tagged 3921789 / 3617673. Heavy battery/starter cables with insulated ring terminals, sealed sensor connectors, bulkhead grommet fitting, and a mid-harness junction block — the loom, tape and boots are all intact with only light shop dirt from storage. Application: Cummins diesel engine wiring harness; may suit B-series / QSB-family installations. Application is not verified — the part number comes from an inventory tag, not a molded number on the harness, so confirm against your engine's CPL and serial number before ordering. Condition: Used take-off, untested. Not continuity tested, load tested, or run. No cut wires, melted insulation, or missing connectors were observed in the photos. Quote is subject to final fitment confirmation by engine/transmission serial number, part number, photos, and supplier availability. Buyer must confirm fitment by part number, photos, dimensions, engine model, serial number, and application before purchase. Used marine part sold as-is unless otherwise stated. No returns on electrical, used, special-order, or installed parts.