E ECSSystemParts

Searched Everywhere? We Have the Harnesses Nobody Else Stocks.

When every supplier says "no," we say "yes." Specializing in hard-to-find wiring harnesses for large mining excavators — Komatsu PC1250, CAT 390D, Hitachi EX1900 — and 2,000+ rare OEM part numbers in stock or custom-built. One piece or a hundred. Stop searching. Start solving.

7-15
Days Production
1+
Piece Minimum Order
50+
Countries Served
15+
Years Experience
2,000+ Rare OEM Part Numbers
Global Free Shipping to 50+ Countries
Large Mining Equipment Specialists Reverse Engineering from Sample
1 Piece — No Minimum Order

When Nobody Else Has It, We Do.

Other suppliers said "discontinued," "out of stock," "can't do it." Here's what we do differently.

Discontinued Models

Your machine is 10+ years old and the factory stopped making harnesses for it. Send us the old one — we'll reverse-engineer and build a brand new one.

Most Common

Urgent Replacement

Equipment down and losing money every day? We prioritize rush orders. Tell us your deadline — we'll move fast to get you back up and running.

Rush Available

Custom Modification

Modified your machine? Added aftermarket systems? Standard harnesses don't fit anymore? We build custom harnesses to your exact specifications.

Made to Order

Can't Identify the Part?

No part number? No problem. Send us photos of your machine, the old harness, or just tell us the model. Our engineers will identify the exact harness you need.

We Help You Find It

What We Build

Every type of wiring harness for engineering machinery

Engine Harness

Complete engine compartment wiring for ECM, sensors, starter, alternator, and injectors

Cab Harness

Internal cab wiring for monitor, switches, joysticks, lighting, HVAC, and seat sensors

Chassis Harness

External chassis wiring connecting frame, hydraulic system, and travel motors

Complete Assembly

Full machine wiring harness kits covering engine, cab, and frame in one package

How It Works

From your problem to a delivered solution — simple and fast

1

Tell Us What You Need

Send us your machine model, part number, photos, or even the old harness. Whatever you have, we'll work with it.

2

We Engineer & Quote

Our engineers analyze your requirements, reverse-engineer if needed, and send you a detailed quote within 24 hours.

3

Production

Once approved, we manufacture your harness to exact OEM specifications. Quality tested before packaging.

4

Ship to You

Free worldwide shipping via DHL/FedEx/UPS with tracking. Typically 7-15 days from order to your door.

Heavy-Duty Mining Harnesses — In Stock & Custom

Browse our rare large-model collection — or ask us about anything you don't see here

Why Customers Come to Us — After Everyone Else Said No

We don't just sell parts. We solve the problems nobody else can.

Exact OEM Match

Every harness built to OEM specifications — same connectors, same wire gauge, same pinout

Free Worldwide Shipping

No hidden costs. DHL/FedEx/UPS with tracking to your door, anywhere in the world

Factory Direct Pricing

You buy straight from the manufacturer. No middleman markup — typically 50-70% less than OEM

Real Engineer Support

Talk to someone who actually knows wiring harnesses. We help you identify, specify, and troubleshoot

Factory Direct — No Middleman

This is where your wiring harnesses are made. A real factory, real people, real stock.

ECS System Parts Manufacturing Workshop - Production Floor with Workers and Equipment

5,000 sqm Manufacturing Facility

Qingdao, China — Crimping, assembly, braiding, testing under one roof

Warehouse Stock Organized by Brand - Caterpillar Wiring Harnesses Ready to Ship

Stocked by Brand

CAT, Komatsu, Volvo, Hitachi — ready to ship in 24-48 hours

Skilled Worker Hand-Assembling Wiring Harness at Workbench

Skilled Assembly Team

Every harness built by experienced technicians, not automated robots

ISO-Certified Production Process
500+ Part Numbers In Stock
100% Tested Before Shipping

Machine Down? Nobody Has the Part? We Do.

Send us your part number, machine model, or photos of the old harness. Even if every other supplier said no — we'll find a way to get you running again.

Talk to an Engineer Now