Komatsu WA600-3 Fuse Box Wiring Harness (No.2)
Fuse Box Wiring Harness (No.2) for Komatsu WA600-3, OEM Quality Replacement Part #421-06-22461
Fitment
Fits the Komatsu WA600-3. ECS lists 4 harness sections for this machine — see all 4 sections for the Komatsu WA600-3 before you order, because the sections are not interchangeable.
Part number reference for the 421-06-22461
This harness is one part sold under one number. Suppliers and parts books write it differently — you may see it as 421-06-22461, 4210622461. 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 Komatsu WA600-3
It sits in or immediately behind the fuse and relay box, where battery power is split into the individual circuits.
What it connects
- Battery feed to the fuse block — the main power distribution point for the circuits it serves.
- Relay coil and contact circuits — the low-current control side and the high-current load side.
- Ground return for the box — shared return for everything fed from that block.
What a failing Komatsu WA600-3 harness looks like
| What the operator reports | Why the harness fits that symptom |
|---|---|
| The same fuse blows repeatedly | A short downstream of the box, not a fuse rating problem. |
| Several unrelated circuits dead at once | A shared feed or ground in the harness feeding the block. |
| Relay clicks but nothing happens | Control side is working; the load side or its ground is not. |
| Everything works until something else is switched on | A shared feed that cannot carry the combined load. |
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 Komatsu WA600-3
Same type of harness on other machines
Product Description
High-quality fuse box wiring harness (no.2) designed for Komatsu WA600-3. This is a complete replacement harness that matches OEM specifications (Part #421-06-22461). All connectors and wiring are tested before shipping. Direct fit installation, no modification required. Made with durable copper wires and heat-resistant insulation for long service life in heavy-duty applications. Factory direct pricing with quality guarantee.
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 | 421-06-22461 |
|---|---|
| Compatible Model | Komatsu WA600-3 |
| Harness Type | Fuse Box Wiring Harness (No.2) |
| Warranty | 12 Months |
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