3-Pin Waterproof Generator & Rectifier Connector – Honda BMW Yamaha OEM QLW-A-3F-GR

Direct-fit replacement for part number QLW-A-3F-GR, a 3-pin IP68 waterproof female connector used for motorcycle generator (alternator) stator coil, rectifier/regulator (R/R unit), and motor coil harness connections on Honda, BMW, and Yamaha motorcycles. The 3-pin design carries the three AC phase outputs from the stator coil to the rectifier unit.

Key Specifications

• Part Number: QLW-A-3F-GR
• Pin Count: 3
• Gender: Female (with wire)
• Wire Gauge: 16 AWG (1.5 mm²) – high-current stator output
• Wire Length: 5.5 inches (140 mm)
• Waterproof Rating: IP68
• Housing Material: PA66 glass-filled nylon
• Terminal Material: Copper alloy, tin-plated
• Current Rating: Up to 15A per pin (AC stator output)

Generator / Stator Pin Assignment (3-Pin AC Output)

Note: All three pins carry AC voltage from the stator – there is no ground or 12V supply pin. The rectifier converts the 3-phase AC to regulated DC.

Compatible Applications

• Honda: CBR, CB, CRF series – stator coil to rectifier/regulator harness connector
• BMW: F-series, G-series – generator stator harness connector
• Yamaha: YZF, MT, FZ series – stator coil harness connector

Stator vs Rectifier – Diagnosis

• Battery not charging: Measure AC voltage between any two stator pins with engine running at 3000 RPM – should read 20–60V AC. Low or zero voltage indicates stator fault, not connector fault
• Connector melting / discoloration: Caused by high contact resistance from a loose or corroded terminal in a high-current AC circuit – replace connector and verify terminal crimp quality
• Intermittent charging: Inspect QLW-A-3F-GR connector for terminal spread – vibration causes terminal loosening in high-current stator circuits

FAQ

Q: Why does the stator connector have 3 pins with no ground?
A: The stator outputs 3-phase AC – each pin carries one phase of the alternating current. There is no DC ground because the stator output is AC. The rectifier/regulator unit converts the 3-phase AC to regulated 12V DC and provides the ground connection.

Q: Can a bad stator connector cause battery drain on a motorcycle?
A: A corroded QLW-A-3F-GR connector causes high resistance in the stator output circuit, reducing charging current to the battery. This causes the battery to gradually discharge during riding, especially at low RPM where stator output is already low.

Package Contents

1 × 3-Pin Female Connector (QLW-A-3F-GR) with 16 AWG wire and terminal insert