Caterpillar M313D Wiring Harness — All 3 Sections
The Caterpillar M313D 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 |
|---|---|---|
| External Harness | Several circuits dead after rain or a wash | External Harness group |
| Engine Harness | Intermittent misfire or a dead cylinder | Engine Harness group |
| Cab Harness | One group of dash functions dead | Cab Harness group |
External Harness 1 part
It is the outside harness on the machine body — exposed to rain, wash-down, mud and UV. On most machines it is the section most often replaced.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 364-2804 | External Wiring Harness | $1935.00 | In stock |
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 |
|---|---|---|---|
| 288-0526 | Engine Wiring Harness | $149.00 | In stock |
Cab Harness 1 part
It enters the cab through the floor or the rear wall and runs behind the trim to the switch panel, the operator seat and the HVAC unit.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 337-5755 | Cab Wiring Harness | $1488.00 | 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.