Caterpillar 365C Wiring Harness — All 6 Sections
The Caterpillar 365C 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 |
|---|---|---|
| Engine Harness | Intermittent misfire or a dead cylinder | Engine Harness group |
| Sensor Harness | Several sensor codes at the same time | Sensor Harness group |
| Instrument & Interior Harness | One instrument or accessory dead | Instrument & Interior Harness group |
| Valve Control Harness | One function slow or dead, others normal | Valve Control Harness group |
| ECU / Controller Harness | Controller dead or rebooting | ECU / Controller Harness group |
Engine Harness 1 part
It runs inside the engine compartment, clipped along the block and head and routed past the front cover. On most machines it is the longest harness on the engine side and the one closest to exhaust heat.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 239-5929 | Engine Wiring Harness | $238.00 | 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 |
|---|---|---|---|
| 234-1183 | Hydraulic Oil Temperature Sensor Wire | $89.00 | In stock |
| 251-0521 | Sensor Air Filter Wiring Harness | $774.00 | In stock |
Instrument & Interior Harness 1 part
It sits inside the cab, behind the trim, feeding the instruments and controls the operator sees and touches.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 251-0520 | Cab Floor Wiring Harness | $1042.00 | 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 |
|---|---|---|---|
| 231-1664 | Solenoid Valve Wiring Harness | $357.00 | In stock |
ECU / Controller Harness 1 part
It sits between the controller box and the machine harness, in the cab or behind a panel, and carries the low-level inputs and outputs the controller reads.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 267-8049 | Main ECU Wiring Harness | $1339.00 | 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.