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Eaton

Eaton Fuller K-3985 Gen 1 ECA Transmission Harness Kit — LAS / VAS

Eaton Fuller K-3985 Gen 1 ECA Transmission Harness Kit — LAS / VAS

$252.95 USD
$252.95 USD
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Product Overview

Genuine Eaton Fuller K-3985 transmission shift-control harness kit for supported automated transmissions using the Generation 1 electronic clutch actuator (ECA).

Technical Identification

  • Manufacturer: Eaton Fuller
  • Part number / SKU: K-3985
  • Product type: Automated-transmission wiring harness kit
  • Primary harness reference: 4307040
  • ECA generation: Generation 1
  • Applicable Gen 1 ECA: 4306651
  • Official configuration reference: LAS / VAS transmission configurations in Eaton warranty and model-specific literature
  • Gen 2 replacement family: K-4255 with Gen 2 ECA 125872, subject to exact transmission configuration

Application and Service Notes

Confirm the complete transmission model and serial number, ECU variant, LAS or VAS configuration, ECA generation, current ECA number, harness connectors, branch lengths, sensor connections, and original harness number before ordering. Do not use K-3985 on a Gen 2 ECA system or substitute another K-3983/K-3984 harness without verifying the ECU and transmission configuration.

Follow Eaton diagnostic procedures before replacing the harness. Inspect fault codes, connector locks, terminal tension, chafing, contamination, continuity, resistance, grounds, power supply, and software level. Programming or ServiceRanger verification may be required after repair.

Please confirm K-3985, 4307040, Gen 1 ECA 4306651, LAS/VAS configuration, transmission serial number, and connector arrangement before ordering.

Parts Verification and Ordering Notice

Please confirm the existing part number, transmission model and serial number, ECU and ECA generation, connectors, electrical specifications, harness routing, included components, and application before ordering. Cross-reference numbers, parts catalogs, service manuals, repair manuals, PDF references, and application guides are reference material only and may contain errors, omissions, superseded information, or model-specific differences.

Technical References and OEM Documentation

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