Honda 3-Pin 6.3mm Waterproof Wire Harness Connector – OEM 7222-6234-40 / 7123-6234-40
Direct OEM-specification replacement for the Sumitomo 3-pin waterproof wire harness connector used on high-current circuits across Honda platforms. Cross-references Sumitomo part numbers 7222-6234-40 (female) and 7123-6234-40 (male). Uses the 6.3mm contact series in dark grey nylon housing with waterproof sealing — the 6.3mm series is Honda’s standard high-current connector for circuits carrying 20A or more, including alternator, starter relay, main fuse box, and high-current body harness connections.
The 6.3mm series connector is used on Honda’s highest-current circuits — alternator output, main relay, starter circuit, and high-current body harness junctions. These connectors are located in the engine bay and are subject to heat cycling, vibration, and moisture ingress. A failed 6.3mm connector on the alternator circuit causes charging system failure (battery warning light, low voltage). A failed connector on the main relay or fuse box circuit causes no-start or intermittent power loss to multiple systems simultaneously. The 6.3mm terminal is also prone to fretting corrosion under vibration, causing high-resistance connections that are difficult to diagnose without connector inspection.
| OEM Number | Type | Application |
|---|---|---|
| 7222-6234-40 | Female housing | Sumitomo 6.3mm 3-pin female |
| 7123-6234-40 | Male housing | Sumitomo 6.3mm 3-pin male |
| Attribute | Detail |
|---|---|
| Pin Count | 3-Pin |
| Contact Series | 6.3mm pitch (high-current series) |
| Housing Material | Nylon, dark grey |
| Sealing | Waterproof |
| Current Rating | High-current (20A+ per terminal) |
| OEM Part Numbers | 7222-6234-40 / 7123-6234-40 |
| Applications | Alternator harness, main relay, starter circuit, high-current body harness |
| Compatible Brands | Honda (Sumitomo 6.3mm platform) |
| Terminal Included | Yes |
Q: My Honda has a charging system warning light — could it be the alternator connector?
A: Yes. A corroded or high-resistance 6.3mm alternator connector is a common cause of charging system faults on Honda vehicles. The 6.3mm terminal is prone to fretting corrosion under engine vibration. Inspect the alternator connector before replacing the alternator or battery.
Q: Are terminals included?
A: Yes, terminals are included with all variants.
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3 Pin Connectors
