| Parameter | Specification |
|---|---|
| Product Name | Caterpillar Engine Wiring Harness / ECM Interconnect Harness |
| Primary Part Numbers | 245-3514 (2453514), 245-3515 (2453515) |
| Brand | COGENG (Premium Aftermarket Replacement) |
| Condition | Brand New, 100% Pin-to-Pin Continuity and Load Tested |
| Engine Compatibility | Caterpillar C11, C12 Diesel Engines |
| Machine Model Compatibility | Caterpillar 950H, 962H, 966G Series II, 972G Series II Wheel Loaders |
| Harness Type | Engine ECM to Machine Systems Interconnect Harness |
| Wire Insulation | Cross-Linked Polyethylene (XLPE) and High-Temperature Polytetrafluoroethylene (PTFE) in Critical Heat Zones |
| Connector Series | Deutsch DT, Deutsch DRC, Ampseal 16, Integrated 70-Pin ECM Connector |
| Protective Sheathing | High-Temperature Split-Loom Nylon Conduit, Self-Fusing Silicone Tape at All Branch Junctions, Adhesive-Lined Heat Shrink Boots |
| Voltage Rating | 24V DC System, 600V Rated Insulation |
| Temperature Rating | -40°C to +125°C Continuous Operation |
| Abrasion Resistance | Meets SAE J1128 and SAE J1939 Environmental Standards |
| Quality Assurance | Automated Crimp Force Monitoring, 100% Dielectric Withstand (HiPot) Test, Continuity Mapping Against OEM Pinout Schematic |
| Shipping Weight | 2.5 kg (Gross, approximate) |
| Package Dimensions | 55 x 45 x 15 cm (Coiled and Flat-Packed in Protective Carton) |
| Return Policy | Non-Returnable / Non-Exchangeable (DOA Guarantee Included) |
The COGENG Wiring Harness, identified by primary part numbers 245-3514 (2453514) and 245-3515 (2453515), is a precision-manufactured electrical distribution harness engineered as a direct replacement for the critical engine management interconnect system on Caterpillar C11 and C12 diesel engines. These engines power the workhorse medium-to-large wheel loader platforms, specifically the Cat 950H, 962H, 966G Series II, and 972G Series II. This harness serves as the essential neural link between the engine-mounted sensors and actuators, the primary Engine Control Module (ECM), and the machine's operator interface and hydraulic control systems.
The operating environment for a wheel loader engine harness is exceptionally punishing. The harness must endure continuous high-frequency vibration from the diesel engine, radiant heat from the exhaust manifold and turbocharger, exposure to diesel fuel, hydraulic oil mist, and engine degreaser chemicals, as well as the constant flexing and abrasion that occurs where the harness bridges the articulated joint between the engine and the machine's main frame. OEM harnesses with part numbers 245-3514 and 245-3515 are known to degrade over time, with common failures including insulation embrittlement leading to wire-to-wire shorts, fretting corrosion on ECM connector pins causing intermittent communication faults, and chafing damage where the harness passes through frame bulkheads. When this harness fails, the symptoms are often catastrophic for productivity: the engine may derate to low power, refuse to start, generate a flood of spurious diagnostic codes, or shut down intermittently during operation. COGENG's aftermarket replacement harness directly targets these known weaknesses. We utilize wire with XLPE insulation that maintains flexibility and dielectric strength even after thousands of thermal cycles. At every branch point, we apply a self-fusing silicone tape wrap that creates a homogenous, waterproof barrier, over which we layer high-temperature nylon split-loom conduit for mechanical protection. The ECM connector is terminated using solid-barrel, gold-plated contacts with a closed-entry socket design, ensuring a consistent, gas-tight electrical connection even under extreme vibration. Every single wire path is verified on a continuity mapping tester against the OEM schematic before the harness is sealed in its shipping packaging. This is a complete, drop-in replacement; every mounting clip, every branch length, and every connector type matches the factory specifications precisely, eliminating the need for cutting, crimping, or adapting during installation. Installing a COGENG harness is the definitive repair for restoring electrical integrity and reliable operation to your Cat wheel loader.
This harness is specifically designed for the Caterpillar C11 and C12 engine installations in the following wheel loader models. Always verify your engine serial number (ESN) and machine PIN for guaranteed compatibility.
| Brand | Model | Machine Type | Engine | Compatible Part Numbers |
|---|---|---|---|---|
| Caterpillar | 950H | Medium Wheel Loader | Cat C11, C12 | 245-3514, 245-3515 |
| Caterpillar | 962H | Medium Wheel Loader | Cat C11, C12 | 245-3514, 245-3515 |
| Caterpillar | 966G Series II | Large Wheel Loader | Cat C11, C12 | 245-3514, 245-3515 |
| Caterpillar | 972G Series II | Large Wheel Loader | Cat C11, C12 | 245-3514, 245-3515 |
Each 245-3514 / 245-3515 Wiring Harness package includes the following:
Main Engine Wiring Harness Assembly (1 unit): The complete engine-to-machine harness, pre-assembled with all connectors, terminals, protective conduit, and factory-positioned mounting clips. The harness is coiled to a minimum bend radius and packed to prevent kinking.
Pre-Installed Connector Seals and Cavity Plugs: All Deutsch, Ampseal, and ECM connectors are fitted with silicone wire seals and plastic cavity plugs in every unused position, preserving the IP67 rating of the connection.
Anti-Static Protective Bag: The coiled harness is sealed inside an anti-static polyethylene bag to prevent any electrostatic charge buildup or moisture contamination during transport.
Heavy-Duty Export Carton: A double-wall corrugated shipping box with reinforced corners, sized to allow the harness to rest in a natural, un-kinked loop.
Note: The following is a detailed technical description of accompanying high-resolution product photographs.
Image 1: Complete Harness Assembly — Jig Layout View
This wide-angle photograph shows the entire 245-3514 harness laid out on a calibrated engineering jig board marked with a 10cm grid. The harness exhibits a branching topology characteristic of an engine harness: a thick main trunk that routes along the engine block, with multiple lateral branches extending to specific sensor and actuator locations. The main ECM connector is positioned at one end of the trunk, while heavy-gauge power and ground cables terminate at the other. Every branch is clearly labeled with a white, heat-shrink printed marker identifying its circuit function or OEM connector number. The overall assembly is wrapped in a combination of black split-loom conduit and amber-colored PET braided sleeving.
Image 2: Primary ECM Connector — Detailed Close-Up
A macro image focuses on the main 70-pin ECM connector body. The image highlights the robust, glass-filled thermoplastic housing with its integrated locking lever in the open position, revealing the pin field inside. The backshell of the connector is shown with a thick-walled, adhesive-lined heat shrink boot that transitions smoothly onto the main harness trunk, providing complete 360-degree strain relief and environmental sealing. Individual wire identification numbers are visible at the rear of the connector, laser-printed on the wire insulation.
Image 3: High-Temperature Sensor Branch — Exhaust Manifold Area
This image shows a branch leg designed to withstand extreme radiant heat, such as the connection for the exhaust gas temperature sensor or turbocharger speed sensor. The protective layering is clearly visible in cross-section at the branch point: the innermost layer is a spiral wrap of high-temperature PTFE tape, followed by a tight-weave stainless steel overbraid for abrasion and heat reflection, and finally covered with a flexible silicone-coated fiberglass sleeve. The branch terminates in a high-temperature rated, ceramic-insert Deutsch connector.
Image 4: Articulation Point Wiring — Flex Zone Detail
A focused shot on the section of the harness designed to cross the articulated joint between the engine and the machine frame. This section features wire bundles that are deliberately coiled in a helical "telephone cord" configuration and wrapped in a flexible, self-lubricating nylon sleeve. This design allows the harness to flex repeatedly as the machine articulates during steering and uneven terrain operation without stretching or fatiguing the copper conductors. The image labels the continuous, molded strain relief boots that protect the transition points where this flexible section joins the rigid engine and chassis harness segments.
Image 5: Power Terminal Junction — Alternator and Starter Connections
This image shows the heavy-gauge cable terminations. A 4 AWG cable with red XLPE insulation ends in a heavy-duty, tin-plated copper ring terminal. The image focuses on the crimp barrel, showing the precise hexagonal compression that creates a cold weld between the terminal and the wire strands. The junction between the crimp barrel and the wire insulation is completely encapsulated in dual-wall, adhesive-lined heat shrink tubing. This seal is critical for preventing battery acid fumes, road salt, and moisture from migrating under the insulation and corroding the copper conductor from the inside out.
245-3514 vs. 245-3515 Distinction: These two part numbers represent closely related variants of the same C11/C12 engine harness platform. The 245-3514 and 245-3515 may have minor differences in connector configuration, wire length, or pin assignments specific to the machine model (H-Series vs. G-Series II), the emissions tier, or the engine's specific rating. While they are often physically interchangeable, it is critical to match the correct number to your machine. Please provide your complete machine PIN and a photo of your old harness label for precise identification.
C11 vs. C12 Engine: Both the C11 and C12 engines were offered in these wheel loader platforms. While they share a common architecture, the electrical harness routing and specific sensor positions can differ. The 245-3514 and 245-3515 harnesses are typically used on both engine variants within the specified machine models, but verification against your engine's arrangement number is always recommended.
G Series II Specificity: The "G Series II" designation (e.g., 966G II, 972G II) is critical. This harness is not compatible with the original 966G or 972G (non-Series II) machines, which used an earlier electrical architecture. Similarly, it is not forward-compatible with the H-Series 966H or 972H without verification, as the 966H and 972H may use a different ECM connector generation.
Professional Installation Recommended: Installing an engine wiring harness requires careful routing to avoid hot spots, sharp edges, and moving linkages. The harness must be secured at every factory P-clip and standoff location. Failing to route the harness correctly can result in immediate damage, such as melted wiring on the exhaust manifold or a severed harness at the articulation point. Always follow the Caterpillar service manual routing diagram for your specific machine serial number.
Note: This is a textual guide corresponding to a numbered, visual step-by-step installation diagram.
Step 1: Machine Preparation and Documentation
The first diagram panel shows a 966G Series II wheel loader with the engine compartment door open. A large red symbol over the battery indicates "Disconnect Batteries — Both Positive and Negative." A camera icon and text instruct: "Photograph the routing of the existing harness from multiple angles. Note every P-clip location, zip tie point, and connector orientation. Do not skip this step."
Step 2: Systematic Old Harness Disconnection
A schematic engine view shows a numbered sequence:
Labeling: Apply numbered tape tags to every sensor and actuator connector as it is disconnected.
Sensor Disconnect: Begin with all sensor connectors (oil pressure, coolant temperature, boost pressure, camshaft position, crankshaft speed).
Actuator Disconnect: Disconnect the injector harness pass-through, turbo wastegate solenoid, and engine brake solenoids.
ECM Disconnect: Release the locking lever on the main ECM connector and gently pull it straight out.
Power Disconnect: Loosen and remove the ring terminal nuts from the alternator, starter motor, and main battery positive junction stud.
Harness Release: Cut all zip ties and release all metal P-clips, carefully pulling the old harness free from the engine.
Step 3: New Harness Comparison and Inspection
The new COGENG 245-3514 harness is shown laid out next to the removed OEM harness on a clean bench. The diagram instructs: "Compare branch lengths, connector types, and terminal lug sizes side-by-side. Verify every connector face has the correct number of pins and the correct keying pattern. Look through the ECM connector to confirm no pins are bent or recessed."
Step 4: Harness Routing and Connection
The diagram shows the new harness being routed onto the engine, following the photographic path recorded in Step 1.
ECM First: Connect the main ECM plug and lock the lever.
Sensor and Actuator Connection: Work methodically from the engine block outward, connecting each labeled sensor branch.
Power Connections: Torque alternator and starter ring terminal nuts to OEM specification.
Securing: Fasten every P-clip and install new, high-temperature, UV-resistant zip ties at every original location. The diagram shows a magnified call-out of a P-clip with the correct bolt torque value.
Step 5: Battery Reconnection and System Verification
The final panel shows the batteries being reconnected. The illustration transitions to a laptop connected to the machine's diagnostic port, displaying the Caterpillar Electronic Technician (ET) screen. The screen reads: "Active Diagnostic Codes: 0." Instructions state: "Crank engine. Monitor oil pressure for immediate rise. Check ECM for logged faults. Run engine to operating temperature. Cycle through all gears and hydraulic functions. Test machine operation before releasing to service."
| Detail | Description |
|---|---|
| Shipping Methods | Express Courier (DHL, FedEx, UPS): Fastest door-to-door for urgent machine-down orders. Economy Air Freight: Cost-effective for single units to international destinations. Sea Freight (LCL/FCL): Most economical for bulk distributor orders. We select the optimal carrier based on destination and urgency. |
| Estimated Delivery Time | Express Courier: 4-7 business days. Air Freight: 8-14 days. Sea Freight: 28-40 days. All transit times are governed by the carrier's operational schedule; the arrival date on the official tracking portal is definitive. |
| Packing | Each harness is coiled to a radius that prevents conductor or insulation stress, sealed in an anti-static polyethylene moisture barrier bag, and flat-packed in a heavy-duty, double-wall corrugated carton. The carton is labeled with "Fragile — Do Not Cut — Electrical Harness Inside." |
| Payment Terms | T/T (Wire Transfer): 30% deposit, 70% balance before shipment. Western Union / MoneyGram: For smaller, time-critical orders. Irrevocable L/C at Sight: For orders over USD $5,000. Trade Assurance payments are accepted and encouraged for buyer protection. |
| Policy Point | Terms |
|---|---|
| Merchant Return Policy | All sales are final. No returns or exchanges. A wiring harness, once removed from its sealed packaging, cannot be returned to inventory. We cannot verify that a returned harness has not been partially installed, subjected to electrical overload, or had its connectors contaminated. This policy ensures that every harness we ship is factory-fresh and untouched. |
| DOA Quality Guarantee | 100% Dead-on-Arrival (DOA) Replacement Guarantee. If the harness is found to have a manufacturing defect (e.g., an open circuit, a mis-pinned connector, or a damaged terminal) upon initial inspection and before installation, we will replace it at no cost. The claim must be reported within 7 days of delivery receipt. Physical damage from improper installation, cutting, stretching, or crushing will void this guarantee. |
| Pre-Shipment Confirmation | We require your visual approval before we dispatch. We will send high-resolution photos of your exact harness laid out on our jig board, with detail shots of the ECM connector face and any unique branch connectors. This is your opportunity to verify compatibility before the shipment leaves our facility. |
Q1: How can I tell if my engine harness is the source of my problems?
A: The most common indicators are: multiple, intermittent fault codes across different engine systems that cannot be resolved by replacing individual sensors; a "No Communication" or "Data Erratic" message from the ECM on the diagnostic tool; visible physical damage such as chafed, melted, or corroded wiring; and the smell of burnt electrical insulation near the engine. If you have performed a wiggle test on the harness while monitoring live data and seen sensor values drop out or spike, the harness has an internal conductor break and must be replaced.
Q2: What is the difference between a 245-3514 and a 245-3515 harness?
A: Both harnesses serve the same C11/C12 engine and 950H/962H/966G II/972G II machine platforms. The suffix difference typically indicates a running production change, a machine option variance (e.g., with or without a secondary steering pump), or a specific engine rating configuration. We will confirm the correct part number by reviewing the photo of your old harness label. In many cases, they are physically interchangeable.
Q3: Is this just the engine harness, or does it include the injector harness?
A: The 245-3514 / 245-3515 is the main engine wiring harness that connects the ECM to the machine and to the various engine-mounted sensors and actuators. The injector wiring harness that runs under the valve cover is typically a separate, internal component. Please check your machine's parts diagram or contact our team if you need the injector harness as well.
Q4: Does this harness come with all the zip ties and mounting clips I need?
A: The harness is supplied with all rubber-lined metal P-clips and plastic standoff clips that are integral to the harness assembly itself. However, we recommend having a supply of new, high-temperature nylon zip ties on hand for securing the harness to the existing machine clips. Reuse of old zip ties is not recommended as they become brittle with heat exposure.
Q5: What precautions do you take to prevent connector damage during shipping?
A: Each connector is individually bubble-wrapped or protected with a slip-on plastic cap before the entire harness is coiled and placed in its carton. The carton is rigid and sized so the harness does not shift. "Do Not Cut" and "Fragile Electronics" labels are prominently displayed. We use industrial-grade packing designed to survive courier handling.
For pricing, immediate machine-down support, fleet quantity quotations, or pre-purchase technical verification, contact your COGENG supplier today.
Sales Price: Contact COGENG sales customer service directly for the most current competitive pricing. Volume discount structures are available for equipment dealers, fleet maintenance organizations, and export distributors. Request a quotation.
Shipping Method & Cost: We will tailor the shipping solution—prioritizing speed or economy per your instruction—and provide a complete door-to-door or port-to-port cost estimate. DDP shipping terms are available for select countries.
Estimated Delivery Time: Delivery timelines are based on the selected carrier's published service standards. Your tracking number will be provided within one business day of shipment dispatch.
✅ Direct OEM Replacement — Jig-Built for Perfect Fit, No Cutting or Splicing Required.
✅ Extreme Environment Ready — Upgraded XLPE/PTFE Insulation, Silicone-Sealed Branches.
✅ In Stock — Ready for Immediate Worldwide Shipping to Minimize Your Downtime.
Critical Next Step: To ensure 100% compatibility, please provide your machine model (e.g., 966G Series II), complete Product Identification Number (PIN), and a clear photo of your old harness identification label and the ECM connector face.
Merchant Return Policy: All products shipped are not returnable or exchangeable. Please complete all compatibility verification steps before final purchase confirmation.
Contact COGENG
📞 Phone: +86-185-2913-1515 🌐 Instagram
📧 Email: hugo@cogeng.net 🌐 Facebook：Excavator Parts Selection and Replacement Community
💬 WhatsApp +86-185-2913-1515 Facebook: Excavator Wiring Harness
💬 WeChat: +86-185-7865-1106 Facebook: Excavator Wire Harness
🌐 Website: cogeng.net
