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.
GDL Bulbs (2002-2004): Design: Ballast
An electronic ballast is connected to each headlamp. The ballast functions as a voltage regulator and generates alternative current (AC).
Main tasks:
- Light the bulb
- Control the light during operation.
To light the bulb an initial voltage of approximately 24, 000 V is required for a very short time (less than 1ms).
The ballast transforms the vehicles 12 V (DC) to 1000 V (AC).
The high tension switch amplifies the voltage a further 25 times.
When the lamp is lit the voltage is reduced to the 100 V required to keep the lamp lit.
Power consumption: 10 W.
Use the Manual With the Right Hardware
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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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