Cummins QSV81G, QSV91G Wiring Diagram (Bulletin No. 4021329-00)

Electrical faults are much easier to trace with the right diagram in front of you. This is the wiring diagram / electrical schematic document for the Cummins QSV81G, QSV91G.

What the diagrams cover

• Engine-side and DC box-side wiring
• Connector views and pin-out reference
• MCM700 / SMM558 control system wiring
• Sensor and ignition system circuits

Models covered

• QSV81G
• QSV91G

User help

1. Make sure it matches your machine. Look up your model and serial number and compare them with the coverage above. Not sure? Send us those details and we will help you check before you buy.
2. Get the file. The product is a digital download delivered for Windows-compatible use. Nothing is shipped.
3. Trace circuits methodically. Identify the circuit, connector or harness in the diagram, then check voltage, continuity and grounds at the points shown before replacing components.
4. Safety first. Work on machinery, fuel and electrical systems carries real risk. Follow the document's safety notes, use suitable tools and supports, and comply with local rules. If a job is beyond your experience, use a qualified technician.

Cummins and all model names are trademarks of their respective owners and are used here only to identify compatibility. This store is an independent seller and is not affiliated with or endorsed by Cummins. For informational and maintenance use.