2-Pin 3.5mm Ignition Coil & Generator Connector – OEM 50290756 / 09441201 / 1685452728
Direct OEM-specification replacement for the 2-pin 3.5mm waterproof connector used on ignition coils and generator (alternator) harnesses. Cross-references OEM part numbers 50290756, 09441201, and 168 545 27 28 (1685452728). Used across BMW and Mercedes-Benz platforms for ignition coil pack and alternator excitation harness connections. Available bare or with 15cm pre-wired leads.
| OEM Number | Brand / Application |
|---|---|
| 50290756 | Ignition coil / generator connector — primary |
| 09441201 | Alternate cross-reference |
| 168 545 27 28 / 1685452728 | Mercedes-Benz connector reference |
| Pin | Function (Ignition Coil) | Function (Generator) | Failure Symptom if Corroded |
|---|---|---|---|
| 1 | +12V power to coil primary winding | Alternator excitation / field winding power | Coil not firing / alternator not charging |
| 2 | ECU trigger signal (coil primary ground control) | Voltage regulator signal / charge indicator | P0351–P0356 misfire / battery not charging, B+ warning |
| Attribute | Detail |
|---|---|
| Pin Count | 2-Pin |
| Terminal Pitch | 3.5mm |
| OEM Part Numbers | 50290756 / 09441201 / 1685452728 |
| Housing Material | High-temp nylon (PA66), waterproof sealed |
| Wire Option | Bare connector / 15cm pre-wired leads |
| Application | Ignition coil harness, generator / alternator excitation harness |
| Compatible Brands | BMW, Mercedes-Benz |
| Code | Description |
|---|---|
| P0351–P0356 | Ignition coil A–F primary / secondary circuit malfunction |
| P0300–P0306 | Random / cylinder-specific misfire |
| P0562 | System voltage low (alternator not charging) |
Q: My BMW has a cylinder-specific misfire and P0352 — is it the coil or the connector?
A: A cylinder-specific misfire with P0352 on BMW is frequently caused by a corroded 2-pin ignition coil connector rather than a failed coil. Swap the coil to another cylinder — if the misfire follows the coil, the coil is faulty. If the misfire stays on the same cylinder, inspect the 2-pin connector before replacing the coil.
Q: My Mercedes battery warning light is on but the alternator tests OK — is it the connector?
A: A battery warning light with a functional alternator on Mercedes-Benz is frequently caused by a corroded 2-pin alternator excitation connector. The excitation circuit (Pin 2) tells the voltage regulator to activate charging — a corroded pin causes the alternator to not receive the activation signal, even though the alternator itself is mechanically functional.
Q: Are terminals included?
A: Yes, terminals are included with all variants.
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2 Pin Connectors
