Caterpillar 349 Wiring Harness — All 6 Sections
The Caterpillar 349 uses 6 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 |
| Fan Drive Harness | Fan will not reverse | Fan Drive Harness group |
| Pump Control Harness | Power derate with no hydraulic leak | Pump Control Harness group |
| Breaker / Hammer Harness | Breaker will not fire, carrier runs fine | Breaker / Hammer Harness group |
| Valve Control Harness | One function slow or dead, others normal | Valve Control Harness group |
| Power Distribution Harness | Voltage at the battery but not at the load | Power Distribution 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 |
|---|---|---|---|
| 586-6583 | Main External Harness | $2679.00 | 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 |
|---|---|---|---|
| 524-5158 | Fan Wiring Harness | $208.00 | In stock |
Pump Control Harness 1 part
It runs in the pump compartment between the pump controls and the machine harness.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 567-7825 | Hydraulic Pump Wiring Harness | $149.00 | In stock |
Breaker / Hammer Harness 1 part
It runs from the breaker or hammer circuit on the boom to the control box in the cab, and takes more flexing than any other section on the machine.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 566-9393 | Breaker Wiring Harness | $253.00 | In stock |
Valve Control Harness 1 part
It runs from the control valve block on the frame up to the ECM or the machine controller, clipped along the boom or the frame as it goes.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 567-2515 | Control Valve Wiring Harness | $595.00 | In stock |
Power Distribution Harness 1 part
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 |
|---|---|---|---|
| 570-9189 | Engine Power Harness | $238.00 | In stock |
Not sure which of the 6 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.