07 GTB HID xenon light not working

[champ]

is that burnt marks on the inside of the cover??

[zch91]

Bloody hell.. There's your problem!

[ditts]

mmmmmmm look like the shit I deal with daily at work
5 hrs is a good effort of arsin about

[dr20t]

Tell me about it

No burn marks that's just rust !

Thankfully I had a spare one otherwise would've been up the creek

Thanks for your help gents

Mick

[Ric]

check the resistance of your ballast
should be about 3 ohms for 50 watt power output using ohms law

How?
You can't just measure it like a resistor with a multimeter. It needs the full 12 volts at high current to operate correctly.