GM 8-Pin Headlight Wire Harness Connector – OEM 15326654 / 15326655 Direct Fit
Direct OEM-specification replacement for the GM 8-pin headlight wire harness connector. Cross-references General Motors part numbers 15326654 and 15326655. Used in headlight assemblies across Chevrolet, GMC, and Buick platforms where low beam, high beam, DRL, and turn signal circuits share a single 8-pin connector housing.
The GM 8-pin headlight connector is a common failure point on high-mileage trucks and SUVs. Moisture ingress through the headlight housing seal causes selective pin corrosion — the DRL and turn signal pins (lower current) corrode first, while the high-current beam pins remain functional. This produces confusing fault patterns: headlights work but DRL warning is on, or turn signal flashes erratically. Replacing the connector resolves these faults without replacing the headlight assembly.
| OEM Number | Application |
|---|---|
| 15326654 | Primary 8-pin headlight harness connector |
| 15326655 | Alternate / superseded part number |
| Pin Group | Function | Failure Symptom if Open/Corroded |
|---|---|---|
| Pins 1–2 | Low beam power and ground | Low beam not illuminating |
| Pins 3–4 | High beam power and ground | High beam not illuminating |
| Pins 5–6 | DRL power and ground | DRL fault, B2590 DTC stored |
| Pins 7–8 | Turn signal / position light | Turn signal not flashing, hyper-flash |
| Attribute | Detail |
|---|---|
| Pin Count | 8-Pin |
| OEM Part Numbers | 15326654 / 15326655 |
| Housing Material | Nylon PA66 |
| Application | Headlight assembly harness, multi-circuit lighting connector |
| Compatible Brands | Chevrolet, GMC, Buick (GM platform) |
| Terminal Included | Yes |
Q: My Silverado DRL light is on but headlights work fine — is it the connector?
A: Yes. DRL fault with functioning low/high beams is a classic symptom of corrosion on the DRL circuit pins (5–6). The GM BCM logs B2590 (DRL relay circuit open) when Pin 5 or 6 loses contact. Inspect and clean the 8-pin headlight connector before replacing the DRL relay.
Q: What fault codes does a failed GM headlight connector cause?
A: Common DTCs include B2590/B2591 (DRL circuit), B0080 (headlamp output fault), and turn signal-specific codes. The BCM may also log U0073 (CAN bus off) if multiple lighting circuits fail simultaneously from a single corroded connector.
Q: Can I replace just the connector without replacing the full headlight harness?
A: Yes. Cut the damaged connector from the existing harness, strip the wires, and crimp or solder the new connector terminals onto the existing wires. No full harness replacement required.
Q: Are terminals included?
A: Yes, terminals are included with all variants.
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8 Pin Connectors
