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296-4617 2964617 Engine Wiring Harness for Cat Excavator 320D E320D 323D C6.4 Engine
Part number 296-4617 2964617 is the Engine Wiring Harness used on Caterpillar E320D, 323D, 320D excavators. This aftermarket replacement from TOPARTS is designed to fit in place of the original without cutting, splicing or rerouting.
It is used with the C6.4 engine and is matched to that engine's sensor and connector layout.
How It Works on Your Machine
Every start, every throttle change and every load the excavator takes on is managed through this harness. It routes power and data between the ECM and the engine-mounted components, so a single damaged wire here can show up as a problem anywhere in the engine's behaviour.
Think of this harness as the communication line of the engine. Speed sensors, temperature senders, pressure switches and fuel system components all report back through it, and the controller sends its commands out along the same path.
Caterpillar machines rely heavily on electronic engine and machine control, which makes healthy wiring essential for performance and fault-free operation.
When to Replace It
Typical signs include:
- Sudden loss of power or the engine entering a derated mode
- Fault codes for sensors, injectors or the ECM appearing on the monitor
- Problems that come and go when the engine heats up or when the machine vibrates
- Engine stalling, misfiring or running roughly at idle
Intermittent faults like these are classic signs of ageing wiring, and they rarely improve on their own.
Why Full Replacement Pays Off
Patching wiring takes time: tracing the fault, cutting, crimping and sealing, often in an awkward position. When the insulation is hardened along the whole length, that time is better spent fitting a new harness that solves every weak spot at once.
Planning the Repair
Electrical problems tend to get worse rather than better. Replacing a deteriorating harness at a planned service interval is far cheaper than dealing with a breakdown in the middle of a job, especially on remote sites.
Frequently Asked Questions
What should I do if the part does not match?
Contact us with photos of the original and the new part. We will help you resolve the issue quickly.
Can I replace only part of the harness?
For a reliable result we recommend replacing the complete harness, since the rest of the old wiring has aged under the same conditions.
Do I need special tools to install it?
Standard hand tools are usually enough. Labelling connectors and taking photos before removal makes the job much easier.
Tips for a Smooth Installation
- Label each connector on the old harness with masking tape before you unplug anything.
- Photograph the routing, clip positions and ground points from several angles.
- Clean and inspect the ECM connector pins; bent pins cause more faults than people expect.
- Keep the new harness clear of the exhaust manifold and turbocharger, and refit all heat shields.
Part Information
- Part Name: Engine Wiring Harness
- Part Number: 296-4617, 2964617
- Engine: C6.4
- Condition: Aftermarket new
- Product Weight: 1 kg / 2.20 lbs
- Brand: TOPARTS
- Warranty: 6 months
- Feature: Matches original routing and length; durable, heat-resistant insulation
Applicable Models
C6.4 Engine, Caterpillar Excavator E320D, 323D
Ordering Information
- 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.
