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.
Component testing procedure
2005 Ford GTSECTION Component testing procedure
WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
HEADLAMP SWITCH - COMPONENT TESTING
| Circuit to test | Connect self-powered test light or ohmmeter to terminals | Move switch to these positions | |
|---|---|---|---|
| Autolamp circuit | 4 and 7 (C205a) | Autolamps | Closed circuit |
| Off | Open circuit | ||
| Parking lamps | |||
| Headlamps | |||
| Off circuit | 9 and 7 (C205a) | Autolamps | Open circuit |
| Off | Closed circuit | ||
| Parking lamps | Open circuit | ||
| Headlamps | |||
| Parking lights circuit | 5 and 7 (C205a) | Autolamps | Open circuit |
| Off | |||
| Parking lamps | Closed circuit | ||
| Headlamps | Open circuit | ||
| Headlamp circuit | 10 and 7 (C205a) | Autolamps | Open circuit |
| Off | |||
| Parking lamps | |||
| Headlamps | Closed circuit | ||
| Interior lamps circuit | 5 and 4 (C205b) | Interior lamps | Closed circuit |
| Off | Open circuit | ||
| Illumination dimmer resistor | 6 and 4 (C205b) | Rotate knob clockwise | Ohmmeter will show smoothly increasing resistance |
RENDER: 1.0x
NO RELATED
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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.