Komatsu 1250-8 Excavator Wiring Harness — All 3 Sections
The Komatsu 1250-8 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 |
|---|---|---|
| Main Harness | Many systems affected at the same time | Main Harness group |
| Sensor Harness | Several sensor codes at the same time | Sensor Harness group |
Main Harness 1 part
It is the trunk harness: the largest loom on the machine, carrying most circuits between the cab, the engine and the rear structure.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 21N-06-41116 | Main External Wiring Harness | $7452.00 | In stock |
Sensor Harness 2 parts
It is the branch that carries pressure, temperature and speed signals from sensors back to the ECM. It usually runs low along the frame or the engine, wherever the sensors are.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 6245-81-5312 | Engine Sensor Wiring Harness | $1012.00 | In stock |
| 6245-81-9130 | Engine Sensor Wiring Harness | $42.90 | 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.