| Parameter | Specification |
|---|---|
| Product Name | Caterpillar Engine Wiring Harness / ECM to Engine Interconnect Harness |
| Primary Part Number | 328-4410 (3284410) |
| Associated / Cross-Reference Part Numbers | 245-3514, 245-3515 |
| Brand | COGENG (Premium Aftermarket Replacement) |
| Condition | Brand New, 100% Continuity Tested and Circuit-Load Verified |
| Engine Compatibility | Caterpillar C11 (All Ratings), C12 (All Ratings) Diesel Engines |
| Machine Model Compatibility | Caterpillar 966G Series II, 972G Series II, 950H, 962H |
| Harness Type | Complete Engine Management Harness — ECM to Sensors, Actuators, Injectors, and Machine Interface |
| Wire Specifications | 22 AWG to 8 AWG; XLPE Insulation; SAE J1128 Type SXL / GXL Rated |
| Connector Types | Deutsch DT, Deutsch DRC, Ampseal 16, Ampseal 14, Integrated 70-Pin ECM Connector with Gold-Plated Sockets |
| Protective Sheathing | Split-Loom Corrugated Nylon Conduit, Self-Fusing Silicone Tape at All Junctions, Adhesive-Lined Dual-Wall Heat Shrink on All Terminations |
| Operating Voltage | 12V / 24V DC System (Engine ECM Operates on 24V Nominal) |
| Temperature Range | -40°C to +125°C Continuous; +150°C Intermittent in Hot Zones |
| Environmental Sealing | IP67 / IP69K Rated Connectors with Silicone Interfacial Seals and Peripheral Gaskets |
| Quality Assurance | 100% Automated Pin-to-Pin Continuity Map, HiPot Dielectric Withstand Test (1000V AC), Crimp Force Monitoring on Every Terminal |
| Shipping Weight | 3.2 kg (Gross, approximate) |
| Package Dimensions | 60 x 45 x 18 cm (Coiled, Protected, Flat-Packed) |
| Return Policy | Non-Returnable / Non-Exchangeable (Comprehensive DOA Guarantee Included) |
The COGENG Engine Wiring Harness, primary part number 328-4410 (3284410), is the definitive electrical backbone for Caterpillar C11 and C12 diesel engines installed in the Cat 966G Series II, 972G Series II, 950H, and 962H wheel loader platforms. This precision-manufactured aftermarket harness is a complete, drop-in replacement for the original equipment component, engineered to restore and enhance the electrical integrity of the entire engine management system. Part number 328-4410 serves as a direct replacement and often a supersession for the earlier 245-3514 and 245-3515 harness variants, consolidating production improvements into a single, robust assembly. This harness is not merely a collection of wires; it is a fully integrated, multi-branch electrical distribution system that connects every engine-mounted sensor, every fuel injector solenoid, every actuator, and the main Engine Control Module (ECM) into a cohesive, noise-immune control network.
The operating environment for a C11 or C12 engine harness inside a production-class wheel loader is among the most severe in all of heavy equipment. The harness must survive constant, high-amplitude vibration transmitted directly from the engine block. It must withstand radiant heat from the exhaust manifold and turbocharger housing that can elevate surface temperatures well beyond the rating of standard automotive wire. It is exposed to diesel fuel spillage, hot engine oil mist, hydraulic fluid aerosols, aggressive degreasing chemicals used in pressure washing, and the relentless mechanical abrasion that occurs as the harness chafes against engine castings, sharp bracket edges, and the moving articulation joint of the loader frame. The consequence of harness failure is immediate and severe: a single chafed wire can ground a sensor signal, causing the ECM to command a full engine derate or trigger a shutdown. Corrosion at the ECM connector pins, driven by moisture wicking under the insulation, can cause intermittent, impossible-to-diagnose communication faults that stop production and frustrate technicians.
COGENG's 328-4410 harness is purpose-built to conquer these failure modes. We start with wire that exceeds SAE J1128 SXL/GXL standards, utilizing XLPE insulation that provides superior cut-through resistance, chemical stability, and a thermal rating of 125°C continuous. In zones adjacent to the exhaust manifold and turbocharger, the harness branches are protected with a multi-layer shield consisting of high-temperature PTFE tape, reflective aluminized fiberglass sleeving, and an outer stainless steel overbraid. Every single branch junction is environmentally sealed using self-fusing silicone tape, which creates a permanent, waterproof, rubber-like barrier that cannot unravel. Every terminal is a solid-barrel, closed-entry design, crimped with automated, calibrated tooling that monitors and records the crimp force for each connection, ensuring a gas-tight, cold-welded bond between the copper conductor and the terminal. The main ECM connector is fitted with gold-plated, machined socket contacts that resist fretting corrosion, the primary cause of intermittent ECM faults. This harness is built on a precision jig that replicates the exact OEM routing, branch lengths, and clip positions, guaranteeing that it will drop directly into your machine without the need to stretch, trim, splice, or re-route any circuit. Installing a COGENG 328-4410 harness eliminates the electrical gremlins that plague aging Cat wheel loaders, restoring reliable engine performance, full power, and dependable operation across all duty cycles.
The 328-4410 harness is specifically engineered for the Caterpillar C11 and C12 engine installations in the following medium and large wheel loader models. Always provide your machine's complete Product Identification Number (PIN) and engine serial number for final confirmation.
| Brand | Model | Machine Class | Engine | Compatible Part Numbers |
|---|---|---|---|---|
| Caterpillar | 966G Series II | Large Wheel Loader | Cat C11, C12 | 328-4410, 245-3514, 245-3515 |
| Caterpillar | 972G Series II | Large Wheel Loader | Cat C11, C12 | 328-4410, 245-3514, 245-3515 |
| Caterpillar | 950H | Medium Wheel Loader | Cat C11, C12 | 328-4410, 245-3514, 245-3515 |
| Caterpillar | 962H | Medium Wheel Loader | Cat C11, C12 | 328-4410, 245-3514, 245-3515 |
Each COGENG 328-4410 Engine Wiring Harness package contains:
Complete Engine Wiring Harness Assembly (1 unit): The fully assembled harness, built on a precision jig, including all connectors, terminals, protective conduits, factory-positioned mounting clips, and P-clips. The harness is coiled to a safe bending radius for transport.
Integrated ECM Connector Assembly: The main 70-pin ECM connector, complete with gold-plated socket contacts, silicone interfacial seal, and a thick-walled, adhesive-lined heat shrink strain relief boot that is pre-installed.
All Sensor and Actuator Connectors: Every connector body is pre-populated with the correct terminals, silicone wire seals, and cavity plugs in all unused positions. Connector types include Deutsch DT, Deutsch DRC, Ampseal 16, and Ampseal 14 as required by the application.
High-Current Power Terminal Assemblies: Heavy-gauge (8 AWG and larger) power and ground cables are terminated with tin-plated, closed-barrel copper ring terminals. The crimp-to-insulation junction is fully encapsulated in dual-wall, adhesive-lined heat shrink tubing.
Anti-Static Protective Bag and Heavy-Duty Export Carton: The harness is sealed in an anti-static polyethylene moisture barrier bag and packed flat in a double-wall corrugated box with molded corner supports and prominent "Do Not Cut — Electrical Harness Inside" handling labels.
Note: The following is a detailed technical description of high-resolution product images that would accompany this listing.
Image 1: Complete Harness — Jig Board Layout (Overhead View)
This wide-angle image shows the complete 328-4410 harness stretched out on a calibrated, white-gridded engineering jig board. The overall topology is a main trunk line with multiple lateral branches of varying lengths. The main trunk, approximately two meters in length, is wrapped in black, high-temperature split-loom nylon conduit. Branches for the fuel injector pass-through, camshaft position sensor, crankshaft speed sensor, and turbocharger wastegate solenoid are clearly visible, each tagged with a white, heat-shrink printed identification label. The image demonstrates the jig-built accuracy: every branch is positioned exactly per the OEM routing specification.
Image 2: Main ECM Connector — Macro Detail
A close-up, high-magnification image of the 70-pin ECM connector body. The connector is shown with its locking lever in the open position, revealing the 70 gold-plated socket contacts arranged in a precise grid. The image highlights the silicone interfacial seal surrounding the pin field. The backshell of the connector is shown with a thick, adhesive-lined polyolefin heat shrink boot that transitions smoothly onto the main harness trunk, providing complete environmental sealing and mechanical strain relief. Individual wire identification numbers are laser-printed on each wire's insulation near the connector backshell.
Image 3: Turbocharger / Exhaust Zone Branch — High-Temperature Protection
This image focuses on a branch leg designed for the extreme radiant heat environment near the exhaust manifold and turbocharger. The image shows a cross-section of the protective layering at the branch point: the innermost wire bundle is spiral-wrapped with high-temperature PTFE tape, over which a reflective aluminized fiberglass sleeve is fitted, and finally protected by an outer layer of flexible stainless steel overbraid. The branch terminates in a high-temperature, ceramic-insert Deutsch connector rated for continuous operation at elevated exhaust-zone temperatures.
Image 4: Articulation Flex Zone — Engine to Chassis Transition
A detailed view of the harness section engineered to cross the articulated pivot point between the engine (rear frame) and the machine's main chassis. This section shows the wires bundled in a helical, extensible coil configuration, wrapped in a flexible, self-lubricating, abrasion-resistant nylon sleeve. The image labels the heavy-duty molded rubber strain relief boots at each end of this flex zone, which are designed to prevent the wires from bending at a sharp angle where they exit the rigid conduit sections.
Image 5: Heavy-Gauge Power Terminal — Alternator Feed
This macro image shows the termination of a main 8 AWG alternator power cable. The wire has red XLPE insulation and ends in a heavy-duty, tin-plated copper ring terminal. The image focuses on the crimp barrel, which shows the precise hexagonal die compression pattern that creates a cold-welded, gas-tight joint. The transition area between the terminal barrel and the wire insulation is completely sealed with a glossy, dual-wall adhesive-lined heat shrink tube. The heat shrink is shown with a slight adhesive melt-out at the edges, proving a complete environmental seal against moisture and acid fumes.
Please read and follow these compatibility notes carefully. They are designed to ensure a first-time correct part match and prevent installation errors.
328-4410 as a Supersession Number: Part number 328-4410 is a later, consolidated service replacement harness that supersedes the earlier 245-3514 and 245-3515 part numbers in the Caterpillar parts system. If your machine currently has a harness labeled 245-3514 or 245-3515, the 328-4410 is the correct, updated direct replacement. It incorporates running production changes, improved connector sealing, and enhanced routing for better service life.
Strict Model Series Compatibility: This harness is designed for the 966G Series II, 972G Series II, 950H, and 962H wheel loaders. It is not compatible with the original 966G or 972G (non-Series II) machines. It is also not compatible with the later 966H or 972H models, which may use a different ECM generation and connector interface. The "Series II" and "H" designations are critical.
Engine Designation — C11 and C12: Both the C11 and C12 engines were offered in these machine models. The 328-4410 harness is designed for both engine variants. However, there can be differences in sensor location and connector keying based on the engine's specific arrangement number. Providing your engine serial number (ESN) allows us to verify the harness against your engine's exact build configuration.
Emissions Tier Awareness: These machines span the transition from Tier 2 to Tier 3 emissions regulations. The 328-4410 harness is typically configured for Tier 3 engine installations with the full suite of emissions sensors (intake manifold temperature, atmospheric pressure, fuel temperature, etc.). If your machine is a very early Tier 2 configuration, please verify the connector count and pin locations against our pre-shipment photos.
Professional Installation is Required: This is a complex engine harness with dozens of connection points. Installation should be performed by a qualified heavy equipment technician with access to the machine's service manual and a Caterpillar Electronic Technician (ET) diagnostic tool. The technician must verify that no active or logged fault codes are present after installation and that all engine operating parameters fall within specification before the machine is released to production.
Note: This is a detailed textual guide accompanying a numbered visual installation diagram.
Step 1: Safety Lockout and Pre-Removal Documentation
The diagram's first panel shows a large 972G Series II wheel loader. A prominent red lockout symbol is superimposed over the battery compartment with the text: "Disconnect Battery Cables — Negative (-) First, Then Positive (+). Lock Out and Tag Out." A digital camera icon reminds the technician: "Photograph Complete Harness Routing. Capture every P-clip, standoff, zip tie, and connector orientation before removing a single connection. These photos are your primary reference during installation."
Step 2: Methodical Old Harness Removal
The diagram shows a schematic engine and frame with a numbered disconnection sequence:
Label All Connectors: Apply numbered wire tags to every connector as it is disconnected. Do not rely on memory.
Disconnect Sensors: Start with the engine-mounted sensors: oil pressure, coolant temperature, intake manifold temperature, boost pressure, fuel temperature, atmospheric pressure, camshaft position, crankshaft speed.
Disconnect Actuators: Disconnect the injector harness pass-through connector, turbocharger wastegate control solenoid, and engine compression brake solenoids (if equipped).
Disconnect ECM: Release the 70-pin ECM connector locking lever and carefully pull the connector straight out. Do not twist.
Disconnect Power: Loosen the nuts on the alternator B+ terminal, the starter motor solenoid and main power terminals, and the battery positive junction stud.
Free the Harness: Cut all zip ties, release all P-clips, and carefully pull the old harness away from the engine.
Step 3: New Harness Visual Comparison
The new COGENG 328-4410 harness is shown uncoiled on a clean workbench next to the removed OEM harness. Arrows indicate key comparison points: ECM connector shape and pin count, branch lengths, connector types, and ring terminal lug diameters. "Verify every connector physically matches before proceeding. If any discrepancy is found, stop and contact COGENG support immediately."
Step 4: Routing and Connection of the New Harness
The diagram shows the new harness being routed onto the engine, following the photographic path recorded in Step 1. The sequence is the reverse of removal:
Secure the Harness Trunk: Position the main trunk along the engine block and secure it loosely at every P-clip and standoff location.
Connect ECM First: Mate the ECM connector, ensuring the seal is fully seated, and lock the lever.
Connect Sensors and Actuators: Methodically connect each labeled sensor and actuator branch. Listen for the audible click of each Deutsch and Ampseal connector locking.
Connect Power Cables: Install ring terminals on the alternator, starter, and junction stud. Torque all power terminal nuts to the OEM specification.
Final Securing: Tighten all P-clips and install new, high-temperature, UV-resistant zip ties. Ensure the articulation flex zone has adequate slack and is not stretched or pinched at any point in the steering cycle.
Step 5: Power-Up, ECM Communication, and Functional Test
The final panel shows the battery being reconnected (positive first, then negative). A laptop running Caterpillar Electronic Technician (ET) is connected to the machine's service port. The ET screen displays: "Active Diagnostic Codes: 0. Logged Codes: 0." The instructions state: "Start engine. Verify immediate oil pressure rise. Monitor all ECM parameters for nominal values. Allow engine to reach operating temperature. Cycle through all gears. Operate all hydraulic functions through their full range. Perform a full steering lock-to-lock test while observing the harness flex zone for adequate clearance. Confirm zero fault codes before releasing machine to service."
| Detail | Description |
|---|---|
| Shipping Methods | International Express (DHL, FedEx, UPS): Priority door-to-door service for machine-down situations. Economy Air Freight: Cost-effective for single units to major international airports. Sea Freight (LCL/FCL): Economical for bulk distributor orders. The optimal method is selected based on destination, urgency, and customer preference. |
| Estimated Delivery Time | Express Courier: 4-8 business days to most global destinations. Air Freight: 8-15 days airport-to-airport. Sea Freight: 30-45 days port-to-port. All delivery timelines are governed by the carrier's published schedule; the arrival date on the tracking portal is the authoritative reference. |
| Packing | The harness is coiled to a safe minimum radius to prevent insulation stress, sealed in an anti-static moisture barrier bag, and placed flat in a rigid, double-wall, export-grade corrugated carton with reinforced corners. The carton is labeled with "Do Not Cut — Contains Electrical Harness" and "Fragile — Handle with Care." |
| Payment Terms | T/T (Telegraphic Transfer): 30% deposit upon order, 70% balance before shipment. Western Union / MoneyGram: Accepted for urgent, smaller-value orders. Irrevocable Letter of Credit (L/C) at Sight: For orders exceeding USD $5,000. Trade Assurance secure payment links are always available for buyer protection. |
| Policy Point | Terms |
|---|---|
| Merchant Return Policy | All Harness Sales Are Final. No Returns, No Exchanges. Once an electrical wiring harness has left our controlled quality environment, we cannot accept its return. We cannot verify that a returned harness has not been partially or fully installed, had its connectors contaminated, been subjected to electrical overload, or been damaged during an attempted installation. This strict policy ensures that every customer receives only a brand-new, untouched, factory-fresh product. |
| DOA Quality Guarantee | We provide a full Dead-on-Arrival (DOA) replacement guarantee. If the harness is received with a manufacturing defect (such as an open circuit, a mis-wired pin per the OEM schematic, or a physically damaged connector not caused by shipping mishandling), we will replace it at no cost for the replacement unit. Any DOA claim must be filed within 7 calendar days of delivery. The harness must be in its original, uninstalled condition. Physical damage from cutting, stretching, crushing, or heat exposure during installation voids this guarantee. |
| Pre-Shipment Confirmation | Your confirmation is mandatory before we dispatch. We will send you a comprehensive pre-shipment document containing: high-resolution photos of your exact harness laid out on our jig board, a close-up of the ECM connector face showing pin positions, and photos of any unique branch connectors specific to your machine's serial number. We ship only after we receive your written approval that the harness matches your failed component. This step is our mutual guarantee of a correct first-time fit. |
Q1: What symptoms indicate my 328-4410 engine harness has failed?
A: The most reliable indicators of harness failure include: multiple, logically unrelated diagnostic fault codes appearing simultaneously; intermittent "No Communication" or "Data Erratic" messages from the ECM on the Cat ET diagnostic tool; engine derate or shutdown that occurs randomly or when the machine articulates or hits a bump; visible chafing, melted insulation, or green corrosion (copper oxide) visible at connector backshells; and a successful "wiggle test" — where moving the harness while monitoring live sensor data causes signal dropout. If you experience these symptoms, the harness is the primary suspect.
Q2: Is 328-4410 the correct harness if my old one is labeled 245-3514?
A: Yes. The 328-4410 is the official supersession part number in the Caterpillar service parts system for harnesses previously numbered 245-3514 and 245-3515. The 328-4410 incorporates all running production improvements and is the correct, current-revision replacement for your machine.
Q3: Does this harness include the injector wiring harness that runs under the valve cover?
A: No. The 328-4410 is the main external engine wiring harness. The internal injector harness that passes through the cylinder head and connects the fuel injectors under the valve cover is a separate component. If you need that harness as well, please contact our sales team, and we can supply it.
Q4: Do I need any special tools or software to complete the installation?
A: Standard hand tools are sufficient for the physical installation. However, you must have access to Caterpillar Electronic Technician (ET) diagnostic software and a communication adapter to verify that no fault codes are present after installation and to monitor engine parameters during the functional test. If you do not have ET access, we strongly recommend that the installation be performed by a Cat dealer or an independent service provider who does.
Q5: What makes the COGENG harness better than a used OEM harness from a salvage machine?
A: A used OEM harness is a significant gamble. It has already endured years of heat cycling, vibration, and chemical exposure. The insulation may be internally degraded and brittle, the connector seals may be deformed, and the terminals may have microscopic fretting corrosion that will cause intermittent faults immediately or soon after installation. A COGENG harness is brand new, built with fresh materials that meet or exceed the original specifications, and is backed by our DOA guarantee. When factoring in the labor cost of installation, the risk of a used harness failing again shortly is not economically justifiable.
For pricing, immediate machine-down technical support, fleet quantity discount structures, or pre-purchase compatibility verification, contact your COGENG supplier now.
Sales Price: Contact COGENG sales customer service directly to receive the most current competitive pricing. We offer significant volume discounts for equipment dealers, regional parts distributors, and large fleet end-users. Request a personalized quotation today.
Shipping Method & Cost: We will quote the optimal shipping solution—whether express courier, air freight, or sea freight—based on your specific delivery timeline requirements and destination. DDP (Delivered Duty Paid) shipping is available for select countries to provide a hassle-free, door-to-door delivered price.
Estimated Delivery Time: Transit times are based on the logistics carrier's published service standards for the selected shipping method. Your tracking number will be provided within one business day of dispatch.
✅ Direct OEM Supersession Replacement — 328-4410 Replaces 245-3514 and 245-3515.
✅ Jig-Built for Perfect Fit — No Cutting, No Splicing, No Stretching Required.
✅ Severe-Duty Construction — XLPE Wire, Gold-Plated ECM Terminals, High-Temp Exhaust Zone Shielding.
✅ In Stock & Ready to Ship — Minimize Expensive Wheel Loader Downtime with Immediate Worldwide Dispatch.
Critical Action Required Before Ordering: To ensure 100% part number accuracy and harness configuration compatibility, please provide your machine's complete Product Identification Number (PIN), the engine serial number (ESN), and a clear digital photograph of your existing harness identification label and ECM connector face. Our technical team will cross-reference your build configuration and provide written confirmation of the correct part match.
Merchant Return Policy: All products shipped are not returnable or exchangeable. Full compatibility verification is a shared responsibility; please complete all pre-purchase checks before finalizing your order.
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