Download your and then perform a “pin-to-pin” check. Here is a simple checklist to print:
| Feature | CM500 (Early) | CM850 (Late) | | :--- | :--- | :--- | | | 50-pin | 60-pin (sometimes 70) | | Connector type | Deutsch HD | Ampseal / Deutsch | | Fuel control | Mechanical FCP (with actuator) | Electronic FSV | | Aftertreatment | None | Optional DPF/SCR | | Diagram color code | Striped wires (White/Red) | Solid + tracer (White-Red) | cummins qsc 8.3 wiring diagram pdf