30-Pin Automotive Waterproof Connector – 13974994, Heavy-Duty Plastic Wire Harness Connector

Part number 13974994 is a 30-pin heavy-duty waterproof automotive connector used in truck, agricultural, and industrial vehicle wiring harnesses. The 30-pin configuration provides sufficient circuits for complex sub-system connections — instrument clusters, body control modules, cab-to-chassis interfaces, and ECM harness connections — while remaining more compact than 46-pin or 62-pin connectors. IP67 waterproof construction ensures reliable operation in underbody and exterior mounting locations on commercial vehicles.

Key Specifications

• Part Number: 13974994
• Pin Count: 30 pins
• IP Rating: IP67
• Housing Material: Glass-filled nylon (PA66-GF), flame retardant
• Operating Temperature: -40°C to +125°C
• Application: Truck, agricultural, and industrial vehicle OEM wiring harnesses

30-Pin Connector — Common Applications

• Instrument clusters: 30-pin connectors are standard for truck instrument cluster connections carrying gauge, warning light, and CAN bus circuits
• Body control modules: BCM connections for lighting, door, and body circuit control
• Cab-to-chassis: Sub-harness connections between cab and chassis electrical systems
• Transmission control: TCM harness connections on automatic and automated manual transmissions
• Agricultural ECM: Engine control module connections on agricultural diesel engines

Frequently Asked Questions

How do I identify the correct replacement for 13974994?

Cross-reference 13974994 with the vehicle’s parts catalog or wiring diagram. This 8-digit format is consistent with Volvo, Scania, and other European truck OEM part numbering systems. Verify the pin count (30), connector gender, locking mechanism, and mounting configuration against the original connector. If the part number is not visible, measure the connector dimensions and pin count for cross-referencing with the manufacturer’s catalog.

Can I repair individual terminals without replacing the entire connector?

Yes. Individual terminal replacement is the preferred repair method — replacing all 30 terminals is significantly more labor-intensive than replacing 1–3 damaged terminals. Use the appropriate extraction tool for the contact size, remove the damaged terminal, crimp a new terminal onto the wire, and reinsert into the housing until the locking lance clicks.

What causes waterproof connector failure in commercial vehicles?

Common failure modes: (1) Wire seal degradation — the individual wire seals around each conductor harden and crack over time, allowing water ingress. Replace wire seals when replacing terminals. (2) Housing cracking from UV exposure and thermal cycling — replace the entire housing if cracked. (3) Terminal corrosion from water ingress through degraded seals — clean corroded terminals with electrical contact cleaner and apply dielectric grease before reassembly. (4) Terminal push-back from improper probe testing — always use a back-probe adapter, never insert a test probe into the connector face.

Typical Applications

• Commercial trucks: Instrument cluster, BCM, and cab-to-chassis harness connections
• Agricultural equipment: ECM and implement harness connections
• Construction equipment: Control harness connections on heavy machinery
• Bus & coach: Body control and lighting harness connections

Package Contents

1 piece — 30-pin automotive waterproof connector 13974994 (housing as specified). Contacts and wire seals ordered separately if not included.