Caterpillar 345B Engine Power Wiring Harness
Engine Power Wiring Harness for Caterpillar 345B excavator. OEM part 143-9058. Direct replacement.
Fitment
Fits the Caterpillar 345B Excavator. ECS lists 12 harness sections for this machine — see all 12 sections for the Caterpillar 345B before you order, because the sections are not interchangeable.
Part number reference for the 143-9058
This harness is one part sold under one number. Suppliers and parts books write it differently — you may see it as 143-9058, 1439058 · CA1439058. 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 345B
It is a power distribution section: it carries battery positive or ground from one point on the machine to another, rather than signals.
What it connects
- Battery feed to the distribution point — the high-current path, with the fusible links or breakers on it.
- Ground return to the frame — the return path that everything else depends on.
What a failing Caterpillar 345B harness looks like
| What the operator reports | Why the harness fits that symptom |
|---|---|
| Voltage at the battery but not at the load | Resistance in this section or at its terminals. |
| Several circuits weak at once | A shared feed or ground with high resistance. |
| Warm cable or terminal after running | Loose terminal or corroded strands inside the lug. |
| Voltage collapses under cranking | This section cannot carry the current any more. |
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 345B
Same type of harness on other machines
Product Description
Engine Power Wiring Harness for Caterpillar 345B excavator. OEM part number 143-9058. 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 | 143-9058 |
|---|---|
| Compatible Model | Caterpillar 345B Excavator |
| Harness Type | Engine Power |
| 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