Caterpillar 330B Display Wiring Harness
Display Wiring Harness for Caterpillar 330B excavator. OEM part 128-7336. Direct replacement.
Fitment
Fits the Caterpillar 330B Excavator. ECS lists 16 harness sections for this machine — see all 16 sections for the Caterpillar 330B before you order, because the sections are not interchangeable.
Part number reference for the 128-7336
This harness is one part sold under one number. Suppliers and parts books write it differently — you may see it as 128-7336, 1287336 · CA1287336. They are all the same part; the number on the tag of your old harness is what settles the order.
If the tag shows a different number entirely, do not order by eye — send us a photo of it on WhatsApp and we will match it against the catalogue before anything ships.
Where this harness sits on the Caterpillar 330B
It runs from the display unit in the cab to the machine harness, usually through the dash area.
What it connects
- Display to the machine data bus — the link that carries gauge and fault data to the screen.
- Display to power and ground — switched power, keep-alive and return.
What a failing Caterpillar 330B harness looks like
| What the operator reports | Why the harness fits that symptom |
|---|---|
| Blank or partial screen | Power and ground first, data link second. |
| Backlight on, no data | The bus side of the circuit. |
| Display drops out when the machine is hot | A connector that opens with temperature. |
| No communication fault stored | The harness between the display and the bus. |
These are circuit-level symptoms, not a diagnosis. The same behaviour can come from a sensor, an ECM input or a mechanical fault — the checks below are how you tell them apart.
How to confirm it is the harness before you buy
- Compare the part number on the old harness. The number is printed on a tag or moulded into the main connector body. If it does not match, stop — stop here and send us a photo, because two sections of the same machine are not interchangeable.
- Resistance test the suspect run. Disconnect both ends and measure end to end. A reading that is far above the others in the same loom means broken strands; a reading to ground means chafing.
- Wiggle test under load. Back-probe the circuit with the machine running and flex the loom by hand along its length, especially at clips and at the cab or boom entry. If the meter or the fault jumps, you have found the run.
Other harness sections for the Caterpillar 330B
Same type of harness on other machines
Product Description
Display Wiring Harness for Caterpillar 330B excavator. OEM part number 128-7336. Direct replacement ensuring plug-and-play installation.
Why Choose ECS System Parts?
- Factory Direct: we build the loom — no middlemen
- In Stock Ready to Ship: most orders leave within 24 hours
- OEM Quality: made to the original drawing, connector for connector
- 1 Year Warranty: full coverage against defects
- Worldwide Shipping: DHL, FedEx, UPS, EMS
- Expert Support: WhatsApp +86-13714733803 — send us a photo of your old harness and we will confirm the section
Technical Specifications
| OEM Part Number | 128-7336 |
|---|---|
| Compatible Model | Caterpillar 330B Excavator |
| Harness Type | Display |
| Warranty | Packaging Machine Normal Use |
Shipping Information
- DHL / FedEx / UPS / EMS worldwide
- Ships within 24 hours
- 3-7 days express, 7-15 days standard
- Tracking number provided
Return Policy
- 30-day return window
- Must be unused, original packaging
- Contact via WhatsApp for RMA authorization