Switchable live...
 

[note small crossposting]
Hopefully a quicky question.

'92 Audi 80 (B4 Chassis) trying to wire in the cars first radio, there
is ISO plugs behind the blanking plate but no switchable live to them.

Dropped the dash cover, checked power at the ignition, you've got a
switchable live on the ignition on the smallish red wire when you put
the key in [1], is that going to be substantial enough to power a modern
stereo or should I be taking a more substantial feed from somewhere
else?

I'd really like it on the key in stage rather than full ignition for
moments like today sat in traffic when you know you aren't going to move
for 20mins, or just having to sit in car can still have the radio on
without engine running, nor a perm live as I recall this radio used to
stay warm with the faceplate off when on a permanent live [2].

Prompt reply would be bloody handy from anyone as the car is still in
bits ;)

TIA

[1] I never could find this bugger in my mk2 Golf for some reason [2]
Currently a Kenwood 6024 MP3 player, likely to get replaced shortly...
(bloody cd drives packed up)
--
Jon B
Above email address IS valid.
<http://www.bramley-computers.co.uk/> Apple Laptop Repairs.

Re: Switchable live...
 

On Tue, 23 May 2006 19:08:03 +0100, black.hole@jonbradbury.com (Jon B)
wrote:

>'92 Audi 80 (B4 Chassis) trying to wire in the cars first radio, there
>is ISO plugs behind the blanking plate but no switchable live to them.

Might sound silly, but are you absolutely sure?

I mean VW's have the permanent and switched live exchanged in the ISO
plug, that's an old porblem with them (so much for ISO). But each one
I saw had them.

Maybe a previous owner had not known that situation and, to get rid of
the unwanted switched one, has cut it off and sealed the blank end?

>
>Dropped the dash cover, checked power at the ignition, you've got a
>switchable live on the ignition on the smallish red wire when you put
>the key in [1], is that going to be substantial enough to power a modern
>stereo or should I be taking a more substantial feed from somewhere
>else?

AFAIK the radios anyway take the power from the permanent live. The
switched live is just that: A sign that you want the radio to operate
:-)

regards

Wolfgang

Re: Switchable live...
 

On Tue, 23 May 2006 19:08:03 +0100, black.hole@jonbradbury.com (Jon B)
wrote:

>'92 Audi 80 (B4 Chassis) trying to wire in the cars first radio, there
>is ISO plugs behind the blanking plate but no switchable live to them.

Might sound silly, but are you absolutely sure?

I mean VW's have the permanent and switched live exchanged in the ISO
plug, that's an old porblem with them (so much for ISO). But each one
I saw had them.

Maybe a previous owner had not known that situation and, to get rid of
the unwanted switched one, has cut it off and sealed the blank end?

>
>Dropped the dash cover, checked power at the ignition, you've got a
>switchable live on the ignition on the smallish red wire when you put
>the key in [1], is that going to be substantial enough to power a modern
>stereo or should I be taking a more substantial feed from somewhere
>else?

AFAIK the radios anyway take the power from the permanent live. The
switched live is just that: A sign that you want the radio to operate
:-)

regards

Wolfgang

Re: Switchable live...
 

On Tue, 23 May 2006 19:08:03 +0100, black.hole@jonbradbury.com (Jon B)
wrote:

>'92 Audi 80 (B4 Chassis) trying to wire in the cars first radio, there
>is ISO plugs behind the blanking plate but no switchable live to them.

Might sound silly, but are you absolutely sure?

I mean VW's have the permanent and switched live exchanged in the ISO
plug, that's an old porblem with them (so much for ISO). But each one
I saw had them.

Maybe a previous owner had not known that situation and, to get rid of
the unwanted switched one, has cut it off and sealed the blank end?

>
>Dropped the dash cover, checked power at the ignition, you've got a
>switchable live on the ignition on the smallish red wire when you put
>the key in [1], is that going to be substantial enough to power a modern
>stereo or should I be taking a more substantial feed from somewhere
>else?

AFAIK the radios anyway take the power from the permanent live. The
switched live is just that: A sign that you want the radio to operate
:-)

regards

Wolfgang

Re: Switchable live...
 

On Tue, 23 May 2006 19:08:03 +0100, black.hole@jonbradbury.com (Jon B)
wrote:

>'92 Audi 80 (B4 Chassis) trying to wire in the cars first radio, there
>is ISO plugs behind the blanking plate but no switchable live to them.

Might sound silly, but are you absolutely sure?

I mean VW's have the permanent and switched live exchanged in the ISO
plug, that's an old porblem with them (so much for ISO). But each one
I saw had them.

Maybe a previous owner had not known that situation and, to get rid of
the unwanted switched one, has cut it off and sealed the blank end?

>
>Dropped the dash cover, checked power at the ignition, you've got a
>switchable live on the ignition on the smallish red wire when you put
>the key in [1], is that going to be substantial enough to power a modern
>stereo or should I be taking a more substantial feed from somewhere
>else?

AFAIK the radios anyway take the power from the permanent live. The
switched live is just that: A sign that you want the radio to operate
:-)

regards

Wolfgang

Re: Switchable live...
 

Wolfgang Pawlinetz <w.pawlinetz@a1.net> wrote:

> On Tue, 23 May 2006 19:08:03 +0100, black.hole@jonbradbury.com (Jon B)
> wrote:
>
> >'92 Audi 80 (B4 Chassis) trying to wire in the cars first radio, there
> >is ISO plugs behind the blanking plate but no switchable live to them.
>
> Might sound silly, but are you absolutely sure?
>
> I mean VW's have the permanent and switched live exchanged in the ISO
> plug, that's an old porblem with them (so much for ISO). But each one
> I saw had them.
>
> Maybe a previous owner had not known that situation and, to get rid of
> the unwanted switched one, has cut it off and sealed the blank end?
>
Positive, there is only one power wire, the second isn't there at all.
The previous (and only owner) has never fitted a radio before.
--
Jon B
Above email address IS valid.
<http://www.bramley-computers.co.uk/> Apple Laptop Repairs.

Re: Switchable live...
 

Wolfgang Pawlinetz <w.pawlinetz@a1.net> wrote:

> On Tue, 23 May 2006 19:08:03 +0100, black.hole@jonbradbury.com (Jon B)
> wrote:
>
> >'92 Audi 80 (B4 Chassis) trying to wire in the cars first radio, there
> >is ISO plugs behind the blanking plate but no switchable live to them.
>
> Might sound silly, but are you absolutely sure?
>
> I mean VW's have the permanent and switched live exchanged in the ISO
> plug, that's an old porblem with them (so much for ISO). But each one
> I saw had them.
>
> Maybe a previous owner had not known that situation and, to get rid of
> the unwanted switched one, has cut it off and sealed the blank end?
>
Positive, there is only one power wire, the second isn't there at all.
The previous (and only owner) has never fitted a radio before.
--
Jon B
Above email address IS valid.
<http://www.bramley-computers.co.uk/> Apple Laptop Repairs.

Re: Switchable live...
 

Wolfgang Pawlinetz <w.pawlinetz@a1.net> wrote:

> On Tue, 23 May 2006 19:08:03 +0100, black.hole@jonbradbury.com (Jon B)
> wrote:
>
> >'92 Audi 80 (B4 Chassis) trying to wire in the cars first radio, there
> >is ISO plugs behind the blanking plate but no switchable live to them.
>
> Might sound silly, but are you absolutely sure?
>
> I mean VW's have the permanent and switched live exchanged in the ISO
> plug, that's an old porblem with them (so much for ISO). But each one
> I saw had them.
>
> Maybe a previous owner had not known that situation and, to get rid of
> the unwanted switched one, has cut it off and sealed the blank end?
>
Positive, there is only one power wire, the second isn't there at all.
The previous (and only owner) has never fitted a radio before.
--
Jon B
Above email address IS valid.
<http://www.bramley-computers.co.uk/> Apple Laptop Repairs.

Re: Switchable live...
 

Wolfgang Pawlinetz <w.pawlinetz@a1.net> wrote:

> On Tue, 23 May 2006 19:08:03 +0100, black.hole@jonbradbury.com (Jon B)
> wrote:
>
> >'92 Audi 80 (B4 Chassis) trying to wire in the cars first radio, there
> >is ISO plugs behind the blanking plate but no switchable live to them.
>
> Might sound silly, but are you absolutely sure?
>
> I mean VW's have the permanent and switched live exchanged in the ISO
> plug, that's an old porblem with them (so much for ISO). But each one
> I saw had them.
>
> Maybe a previous owner had not known that situation and, to get rid of
> the unwanted switched one, has cut it off and sealed the blank end?
>
Positive, there is only one power wire, the second isn't there at all.
The previous (and only owner) has never fitted a radio before.
--
Jon B
Above email address IS valid.
<http://www.bramley-computers.co.uk/> Apple Laptop Repairs.

Re: Switchable live...
 

On Tue, 23 May 2006 21:11:28 +0100, black.hole@jonbradbury.com (Jon B)
wrote:

>Wolfgang Pawlinetz <w.pawlinetz@a1.net> wrote:
>
>> On Tue, 23 May 2006 19:08:03 +0100, black.hole@jonbradbury.com (Jon B)
>> wrote:
>>
>> >'92 Audi 80 (B4 Chassis) trying to wire in the cars first radio, there
>> >is ISO plugs behind the blanking plate but no switchable live to them.
>>
>> Might sound silly, but are you absolutely sure?
>>
>> I mean VW's have the permanent and switched live exchanged in the ISO
>> plug, that's an old porblem with them (so much for ISO). But each one
>> I saw had them.
>>
>> Maybe a previous owner had not known that situation and, to get rid of
>> the unwanted switched one, has cut it off and sealed the blank end?
>>
>Positive, there is only one power wire, the second isn't there at all.
>The previous (and only owner) has never fitted a radio before.

Then I may make a suggestion as you have aleady the car in pieces :-)

You've found a switched wire, so you might as well slap a relay (radio
shack?) behind the radio, route a cable from the permanent live to the
relay IN, route a cable from the switched live from the ignition to
the relay SWITCH and route a cable from the relay OUT to the proper
ISO connector position. Place a fuse in the feed from the permanent
live and you're done.

Crude, but it should work just fine. The relay will seperate the
circuits, and using the permanent live as the power source and using
the switched life from ignition just to switch the relay will make
sure you'r not overloading the switched live.

JM2C (make sure the fuse is dimensioned adequately)

Wolfgang