Caterpillar D6RII Wiring Harness — All 3 Sections
The Caterpillar D6RII uses 3 separate harness sections that ECS builds. They are not interchangeable: the part number on your old loom decides which one you need. Below they are grouped by where each section sits on the machine, with the part numbers and the symptoms that point to each group.
Which section do I actually need?
Start from the fault, not from the part name. Find the symptom the operator reports, then open that group.
| Section | First symptom to look for | Group |
|---|---|---|
| Transmission Harness | Limp mode or a single gear only | Transmission Harness group |
| Power Distribution Harness | Voltage at the battery but not at the load | Power Distribution Harness group |
Transmission Harness 1 part
It runs from the transmission control valve and speed sensors up to the ECM or the transmission controller.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 210-2509 | Transmission Connection Wiring Harness | $268.00 | In stock |
Power Distribution Harness 2 parts
It is a power distribution section: it carries battery positive or ground from one point on the machine to another, rather than signals.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 172-4854 | Engine Power Wiring Harness | $1190.00 | In stock |
| 224-9459 | Engine Power Wiring Harness | $744.00 | In stock |
Not sure which of the 3 sections is yours?
Send a photo of the tag on your old harness to WhatsApp +86-13714733803 and we will confirm the part number against this list before you order. Getting the section wrong is the most common reason a replacement does not fit.