Mark Yer i agree with you there Bob, there would be a common -ve for the speakers and one of the speakers is using park light circuit as a ground. The stereo prolly isnt liking it too much, but it'll run like that.
What you want to do is get a D size battery and connect it to what you think is the left speaker, ground the -ve side of the battery and by tapping it on the +ve you'll hear the speaker move in and out. THen do the same for the other one. This will mean you know which is which for the speaker wires. The two wires you have left will be the illumination and the speaker ground. Hold both of these and turn the park lights on, then test both. One should light up and the other will not. Just to check leave the circuit tester in the end of the wire and turn the park lights off. Once you've done this you'll know exactly what every wire is. Hope this helps Chris S ----- Original Message ----- From: "Bob" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, January 21, 2003 7:06 PM Subject: Re: Mobile electronics > 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]/ ---------------------------------------------------------------------
