The shared earth idea might not be a bad one - you could try disconnecting each earth in turn and seeing that each associated speaker dies as you would expect. Did you trace the wires back from the speakers?
------------------- > Thanks for the replies, but the problem is i can't find a fuse that has been blown! Also, there were only 7 wires going to the old head unit - which seemed to me to be: > Constant 12v > Accessory 12v > Earth > Front left neg > Front left pos > Front right neg > Front right pos > (there were no rear speakers) > Out of those 7 wires which one is likely to have been the illumination wire?? > - Something that came to me just then is that maybe the old stereo used a common ground between the two front speakers, which would mean one of the wires that i have hooked up to a speaker could be the illumination wire... does this sound possible? The only thing that makes that hard to believe is that both the front speakers are working :( > > Any more ideas guys? much appreciated! > Mark > > --- "GREENBURY, Andrew Robert" <[EMAIL PROTECTED]> wrote: > >Hi Mark, > > > >Just to add to Chris's response, modern cars have factory stereos which > >change their illumination when you turn your headlights on - to know the > >lights are on they need a signal from the illumination circuit. Hence when > >you replace the head unit you have this 'extra' wire that doesnt seem to > >do much so it is assumed to be extraneous, or hooked up to the wrong thing > >etc, resulting in fuses blowign etc. this wire from the illumination > >circuit is generally simply 0V that goes to +12V when you turn your > >headlights on. Hope this explains why the illumination circuit has to do > >with a stereo a bit better. > > > >Andrew > > > >On Mon, 20 Jan 2003, Mark Firman wrote: > > > >> Hi all, > >> Can anybody who knows a bit about mobile electronics explain to me the > >> concept of the illumination circuit (i.e. dash lights etc) and how it > >> works, and also why it has anything to do with a car's stereo ... Any > >> explanation, complex or simple, would be a great help! > >> Cheers, > >> Mark Firman > >> > >> _____________________________________________________________ > >> Get Your free Ozdat Email Account > >> ---> http://www.ozdat.com > >> > >> _____________________________________________________________ > >> Select your own custom email address for FREE! Get [EMAIL PROTECTED] w/No Ads, 6MB, POP & more! http://www.everyone.net/selectmail?campaign=tag > >> > >> > > > > _____________________________________________________________ > Get Your free Ozdat Email Account > ---> http://www.ozdat.com > > _____________________________________________________________ > Select your own custom email address for FREE! Get [EMAIL PROTECTED] w/No Ads, 6MB, POP & more! http://www.everyone.net/selectmail?campaign=tag > > --membersozdat------------------------------------------------------- > OZDAT Mailing List Please Note:- > Send (un)subscribe requests to [EMAIL PROTECTED] > Send submissions to [EMAIL PROTECTED] > No unauthorised redistribution of this email > http://www.ozdat.com/ozdatonline/index.htm > http://www.ozdat.com/ozdatonline/listindex.html > http://www.mail-archive.com/[email protected]/ > --------------------------------------------------------------------- > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[email protected]/ ---------------------------------------------------------------------
