3-Pin Motorcycle Rectifier & Ignition Wire Harness Connector – Female OEM

This 3-pin female connector is used in motorcycle regulator/rectifier and ignition coil harnesses. The 3-pin configuration serves two distinct motorcycle electrical applications: the regulator/rectifier (which converts AC alternator output to regulated DC for battery charging) and the ignition coil (which generates the high-voltage spark for combustion). Available bare or with 15cm pre-wired leads.

Key Specifications

• Pin count: 3-pin
• Gender: Female
• Housing material: High-temp nylon (PA66)
• Available as: Bare connector or 15cm pre-wired leads
• Application: Regulator/rectifier harness, ignition coil harness

Application 1: Regulator / Rectifier Circuit Assignment

• Pin 1 (AC1): AC input from alternator stator (phase 1)
• Pin 2 (AC2): AC input from alternator stator (phase 2)
• Pin 3 (DC+): Regulated DC output to battery positive

The regulator/rectifier converts the alternator’s AC output to regulated 14.4V DC for battery charging. A corroded regulator/rectifier connector causes charging system failure — the battery discharges and the motorcycle eventually stops running.

Application 2: Ignition Coil Circuit Assignment

• Pin 1 (B+): Coil primary power supply (+12V)
• Pin 2 (IGT): Ignition trigger signal from CDI or ECU
• Pin 3 (GND): Coil primary ground

Common Fault Symptoms

Regulator/Rectifier connector faults:

• Battery not charging (voltage below 13.5V at idle with engine running)
• Battery overcharging (voltage above 15V — regulator not controlling output)
• Motorcycle running on battery only, eventually stopping

Ignition coil connector faults:

• No spark or intermittent spark
• Engine misfire at specific RPM ranges
• Hard starting or no-start

Frequently Asked Questions

Q: How do I test if my regulator/rectifier connector is faulty?
A: Measure battery voltage with the engine running at 3,000 RPM. A healthy charging system should read 13.5–14.8V. Below 13.5V indicates a charging fault — check the regulator/rectifier connector before replacing the regulator/rectifier ($30–$150) or the stator ($80–$300).

Q: Are terminals included?
A: Yes, terminals are included with all variants.