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 2006 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
MAIN LIGHT SWITCH COMPONENT TESTING
| Circuit to test | Connect self-powered test light or ohmmeter to terminals | Move switch to these positions | A good switch will indicate |
|---|---|---|---|
| Autolamp Circuit | 4 and 7, C205a | Autolamps | Closed circuit |
| Off | Open circuit | ||
| Parking Lamps | |||
| 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 |
| Fog lamp circuit | 6 and 7, C205a | Fog lamps | Closed circuit |
| Off | Open circuit |
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.