5-Pin 6.3mm Relay / Wiring Harness Repair Connector – OEM CY7051-6.3-21 | Female Plug
Direct OEM-specification replacement for the 5-pin 6.3mm female wire harness connector used on automotive relay sockets and wiring harness repair applications across multiple vehicle platforms. Cross-references OEM part number CY7051-6.3-21. Uses the 6.3mm contact series in female housing — the 6.3mm series is the standard contact pitch for automotive relay sockets, fuse box connectors, and high-current body harness junctions where the connector must carry relay coil and contact currents simultaneously.
The 5-pin 6.3mm relay connector is used on relay sockets throughout the vehicle — in the engine bay fuse box, interior fuse box, and body harness relay mounts. A failed relay connector causes the relay to lose contact with the harness, resulting in the loss of the circuit controlled by that relay (fuel pump, cooling fan, horn, starter, A/C compressor, etc.). The 6.3mm terminal is susceptible to fretting corrosion under vibration, which increases contact resistance and causes intermittent relay operation before complete failure.
| OEM Number | Application |
|---|---|
| CY7051-6.3-21 | 5-pin 6.3mm female relay / harness repair connector (universal) |
| Pin | ISO 7588 Terminal | Function |
|---|---|---|
| 1 | 85 | Relay coil ground (ECM or switch-controlled) |
| 2 | 86 | Relay coil power supply (12V) |
| 3 | 30 | Common contact (battery or fused supply) |
| 4 | 87 | Normally open contact (load circuit) |
| 5 | 87a | Normally closed contact (alternate load circuit) |
| Attribute | Detail |
|---|---|
| Pin Count | 5-Pin |
| Contact Series | 6.3mm pitch |
| Gender | Female |
| Sealing | Non-waterproof (interior / fuse box application) |
| OEM Part Number | CY7051-6.3-21 |
| Applications | Relay socket, fuse box connector, wiring harness repair |
| Compatible Models | Universal — fits standard ISO 7588 5-pin relay sockets across all vehicle makes |
| Terminal Included | Yes |
Q: What relay types fit this socket?
A: This socket fits standard ISO 7588 5-pin automotive relays (mini relay format) used across all vehicle makes. Confirm the relay pin layout matches the ISO 85/86/30/87/87a configuration before ordering.
Q: Are terminals included?
A: Yes, terminals are included with all variants.
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5 Pin Connectors
