Honda Dio 110cc 3-Pin AC Assembly / Motorcycle Switch Wire Harness Connector – OEM CY000312-1.5F
Direct OEM-specification replacement for the 3-pin wire harness connector used on the AC generator (alternator) assembly and handlebar switch harness of the Honda Dio 110cc scooter. Cross-references Honda OEM part number CY000312-1.5F. Uses the 1.5mm contact series in white nylon and rubber housing — designed for the vibration and moisture environment of a scooter engine bay and handlebar assembly.
The Honda Dio 110cc AC connector is a common failure point on high-mileage scooters. The 3-pin housing is located near the engine, exposed to heat, vibration, and fuel/oil contamination. Connector failure causes loss of AC power to the lighting circuit or ignition system, producing symptoms such as dim or flickering headlights, no charging, or intermittent ignition cut-out. These faults are frequently misdiagnosed as a failed CDI unit or stator coil. Replacing the connector is the correct first step when the stator output voltage tests within specification.
| OEM Number | Application |
|---|---|
| CY000312-1.5F | Honda Dio 110cc AC assembly / switch harness connector |
| Pin | Function | Failure Symptom if Open |
|---|---|---|
| 1 | AC output Phase 1 (lighting coil) | Headlight dim or off, no AC lighting |
| 2 | AC output Phase 2 (ignition coil) | Intermittent ignition cut-out, no start |
| 3 | Ground / neutral | Erratic AC output, charging fault |
| Attribute | Detail |
|---|---|
| Pin Count | 3-Pin |
| Contact Series | 1.5mm pitch |
| Housing Material | Nylon and rubber (vibration-resistant) |
| Housing Colour | White |
| OEM Part Number | CY000312-1.5F |
| Applications | AC generator harness, handlebar switch harness |
| Compatible Models | Honda Dio 110cc scooter |
| Terminal Included | Yes |
Q: My Honda Dio headlight is dim and flickering — could it be the AC connector?
A: Yes. Dim or flickering headlights on the Honda Dio 110cc are a classic symptom of a corroded or open AC lighting coil pin (Pin 1) in the 3-pin AC connector. Test the stator AC output voltage first — if it is within specification (typically 12–14V AC at idle), the fault is in the connector or wiring, not the stator.
Q: Can a failed AC connector cause a no-start condition?
A: Yes. If Pin 2 (ignition coil AC feed) is open or corroded, the CDI unit loses its AC power supply and cannot generate the ignition spark. This produces a no-start condition that is frequently misdiagnosed as a failed CDI or spark plug. Inspect the 3-pin AC connector before replacing the CDI unit.
Q: Are terminals included?
A: Yes, terminals are included with all variants.
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3 Pin Connectors
