8-Pin 1.0mm Unsealed Female Connector – Motorcycle ECU Harness Molex 39-01-2080 / 3901-2080

Direct-fit replacement for Molex part number 39-01-2080 (also referenced as 3901-2080), an 8-pin 1.0mm pitch miniature unsealed female connector used in motorcycle ECU sub-harness, instrument cluster, and body control signal circuits. The Molex 39-01 series (Micro-Fit 3.0 adjacent) is widely used across Japanese motorcycle OEM platforms for high-density signal harness applications.

Key Specifications

• Part Numbers: 39-01-2080 / 3901-2080 (Molex)
• Pin Count: 8
• Gender: Female (with wire)
• Terminal Pitch: 1.0mm
• Wire Gauge: 22–24 AWG (0.2–0.3 mm²)
• Wire Length: 5.5 inches (140 mm)
• Sealing: Unsealed (interior / protected harness location)
• Housing Material: PA66 glass-filled nylon
• Terminal Material: Copper alloy, gold-plated
• Current Rating: Up to 2A per pin (signal circuits)

39-01-2080 vs 3901-2080 – Same Part, Two Formats

Both 39-01-2080 and 3901-2080 refer to the identical Molex connector. The hyphenated format (39-01-2080) is the standard Molex part number notation; the continuous format (3901-2080) is commonly used in aftermarket catalogues. Both are interchangeable when ordering.

Compatible Applications

• Honda / Yamaha / Kawasaki / Suzuki: ECU sub-harness sensor signal connectors, instrument cluster data connectors, body control signal circuits

Diagnosis – Common Faults

• Intermittent ECU fault codes: Inspect 1.0mm terminal contact pressure – micro-terminals are prone to spread from vibration
• No signal from speed or TPS sensor: Check terminal insertion depth – a partially inserted 1.0mm terminal makes intermittent contact

FAQ

Q: Is 39-01-2080 the same as 3901-2080?
A: Yes – both refer to the identical Molex 8-pin 1.0mm connector. The hyphenated format is the standard Molex notation; the continuous format is used in aftermarket catalogues.

Package Contents

1 × 8-Pin Female Connector (39-01-2080 / 3901-2080) with wire and terminal insert