English 
0001303 External Wiring Harness for Hitachi EX400-3 Excavator
Part number 0001303 is the External Wiring Harness used on Hitachi EX400-3 excavator. This aftermarket replacement from TOPARTS is designed to fit in place of the original without cutting, splicing or rerouting.
Product Details
- Part Name: External Wiring Harness
- Part Number: 0001303
- Condition: Genuine new
- Product Weight: 10 kg / 22.05 lbs
- Brand: TOPARTS
- Feature: Matches original routing and length; durable, heat-resistant insulation
Fits the Following Machines
Hitachi EX400-3
Function Overview
Laid out around the frame and through the house of the excavator, this harness is the long-distance carrier of the electrical system. It ties together the cab controls, controllers, pump and valve solenoids, sensors and lighting into one connected network.
Where the engine harness serves the engine, the external or main harness serves the whole machine. It connects the major systems of the excavator, so when it is damaged the symptoms can appear in places that seem unrelated: lights, gauges, solenoids, starting and more.
Hitachi ZAXIS and EX series machines combine electronic engine control with electronically managed hydraulics, so both systems depend on sound wiring to deliver their rated performance.
Reducing Downtime
Dealer lead times for wiring harnesses can stretch to weeks. Ordering a replacement in advance, or as soon as faults begin to appear, keeps your project on schedule and avoids rental costs for a substitute machine.
Warning Signs to Watch For
Watch for these symptoms:
- Rodent damage, crushed sections or wires worn through where the harness rubs the frame
- Blown fuses that keep recurring with no obvious cause
- Work lights, horn or wipers working only some of the time
- Monitor warnings that disappear when the machine is stopped
- Several unrelated circuits failing at once
When diagnostics point to a circuit fault rather than a failed component, replacing the wiring is often the most cost-effective repair.
Construction and Quality
We check connector fit, wire continuity and overall layout before shipping, so the harness you receive is ready to install. The materials are chosen for the temperature range, vibration and contamination found on construction equipment.
Make Sure It Fits
Before ordering, compare the part number printed on the label of your original harness with 0001303. It is also worth comparing the connector shapes and the number of branches with our product photos. If your machine's serial range or engine variant differs, send us your machine details and we will confirm compatibility before you buy.
Installation Guide
- Disconnect the battery isolator before starting.
- Work section by section, transferring clips and ties as you go, rather than removing the whole harness at once.
- Check every ground strap and clean its contact surface to bare metal.
- Add protective sleeving wherever the old harness showed signs of rubbing.
- Test lights, horn, solenoids and the monitor before refitting covers.
Payment & Shipping
- Payment Method: PayPal, Stripe, Credit card, Visa, etc.
- Shipping Method: DHL, FedEx, UPS, TNT, USPS EMS, etc.
- Track Your Order: An email containing the tracking number with a link will be sent to you as soon as it ships.
Note: Please verify your part number and match our product pictures to your original item before ordering. If you have any questions, please feel free to contact us. Thanks.
