like Delboy said.
Most of the LEDs in cars seem to be 5v.
Slapping 9v or 12v through them will cause them to burn out.
They run 12v from the car power source cause they are done series or has resistors to step the voltage down.
If you want to test a LED to make sure it works, get your multimeter and set it to continuity mode and use that.
The LEDs won't very bright but you can check colour and if they work.
Don't forget LEDs will only work if the positive and negative is connected the correct way round.
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06 3.0TDI Quattro:
Options:
Soft close Doors & Boot, Electric Blinds, Keyless Entry & Start, Bluetooth HandFree, Quad Zone Climate, APS+, 3 Spoke Sports Tiptronic Multi Function Steering Wheel, Heated Seats All Round, Black Leather Comfort Seats, AMI, Sunroof, Drivers & Passenger Electric Memory Seats, Auto Dimming Mirrors, Bi-Xenons AFS2, Dab, Digital TV, Reversing Camera, AV Inputs, Fridge, Solar Roof, TPMS, facelift rear lights, 3G, remote boot closure, Tow Bar.
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