Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2005 Mercury Mariner 3.0 1, FWDFACTORY OEM SERVICE PROCEDURE
Ignition Switch Connector End View (C250)
C250 CONNECTOR SPECIFICATION
| Pin | Circuit | Gauge | Circuit Function | Qualifier |
|---|---|---|---|---|
| 1 | 1050 (LG-VT) | 20 | Voltage supplied in Start and Run (overload protected) | |
| 2 | * | * | not used | |
| 3 | 1151 (DG-OG) | 20 | Ignition key lock solenoid control | |
| 4 | 1715 (RD) | 18 | Voltage supplied at all times (overload protected) | |
| 5 | 158 (BK-PK) | 18 | Key in ignition switch signal | |
| 6 | 297 (BK-LG) | 18 | Voltage in Run or Accessory (overload protected) | |
| 7 | 306 (TN-LB) | 20 | Voltage supplied in Start (overload protected) |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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