I've got an amp in my car that takes 150a worth of fuses :-P
If its only 5a then the CD changer wire might be acceptable, but do double check it is 5a as it seems a bit small...
Trace the CD changer wire back to where it originates and make sure its still connected, if its possible, get a multimeter (100 and 1 uses that thing!) and test to see if its recieving current. Multimeter's are about a tenner i think from halfords last time i checked...
Thanks for your comments. I will try the site you suggested.
>
> The bass tube (100W max) has a built in amp and only draws a max of
> 5amp. I wouldn't imagine the changer wiring would struggle with such a > small current?
>
> I have the max power manual for the car and have read a guide on how
> to install the power cabling, just trying an easy option! ;-)
>
> I would of thought the cd changer wiring is already fused too.
> At the moment it seems dead, and I have checked all the fuses.
>
> Rich.
>
> > first off,
formatting link
> >
> > secondondly, you must lay a new power cable to the boot, the tiny little
> > wire coming from your CD changer won't be thick enough to carry the current
> > needed
> >
> > what active sub is it? you have to find an approriate grounding point and
> > make sure you fuse the power cable at the battery end
> >
> > Might seem alot of work, but this kind of thing has to be done properly to
> > get results
> >
> > > Hi, I was intending to fit an active bass tube to my 306 XSi. > > >
> > > Instead of running a whole new set of power cabling and putting a
> > > switch somewhere on the dash, I was going to try and use the live from
> > > the (un-used) cd changer wiring, which is already there.
> > >
> > > I have tried testing the wiring with a simple lamp to try and find the
> > > live, but with no luck. (Stereo on, ignition on).
> > >
> > > Does anyone know if you have to do something (like fit a particular
> > > fuse etc.) to enable the cd-changer wiring?
> > > Or, which of the wires is the live?
> > >
> > > I really don't want to have to fetch all of the interior up just to
> > > add a wire to power the tube. I don't want to have to add a new
> > > (probably cheap looking) switch on the dash somewhere either! > > >
> > > Cheers, Rich.