Caterpillar 966H Wiring Harness — All 4 Sections
The Caterpillar 966H uses 4 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 |
|---|---|---|
| Chassis Harness | Functions lost when the machine articulates or steers | Chassis Harness group |
| Sensor Harness | Several sensor codes at the same time | Sensor Harness group |
| Fan Drive Harness | Fan will not reverse | Fan Drive Harness group |
| Console Harness | Console buttons dead, machine still runs | Console Harness group |
Chassis Harness 1 part
It runs along the frame between the front and rear of the machine, clipped to the structure and passing articulation or steering joints.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 245-3257 | Chassis Wiring Harness | $1786.00 | In stock |
Sensor Harness 1 part
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 |
|---|---|---|---|
| 247-3773 | Hydraulic Sensor Wiring Harness | $208.00 | In stock |
Fan Drive Harness 1 part
It runs from the fan drive or reversing-fan solenoid to the machine harness near the radiator.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 273-0275 | Chassis Fan Wiring Harness | $536.00 | In stock |
Console Harness 1 part
It runs from the console or the armrest switch pod into the main cab loom.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 310-7565 | Console Wiring Harness | $238.00 | In stock |
Not sure which of the 4 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.