07 vauxhall vectra factory stereo

I'd like to thank you for the help you gave me about a year ago fitting a sub and speaker-upgrades to my motor. The thing has worked a charm since we worked out why I was blowing my front speakers. I've now been given a company car, Its as good as free, so I wont be knocking it back, but I faced with the nightmare that is a factory fit Vauxhall Vectra stereo. I can't do much but I am thinking about fitting a stealthy Sub into the boot powered from I'm not sure where yet.. It's a small sup, the amp is only a small sony xm-255EX It has a 20 amp fuse but I doubt it actually pulls that! I think there is a cigarette lighter in the rear of the car, anyone know what sort of current you can pull through a cigerette lighter? 8A rings a bell!

For a tempoy Sub instalation, I need 12Volts, I have a cigarette lighter in the rear of the car, anyone know what sort of current you can pull through a cigerette lighter? 8A rings a bell!

this may or may not help but could you not just look at the fuse for the cig lighter and then use that as your rough guideline?

Can anyone help with a scmatic of the Opal/Vauxhall Vectra 2007 wiring.Particually the factory fit stereo, i need to know the wire colours of the feed to the rear speakers!Any help apriciated