Sony Wirring

On 14 Aug 2003 05:00:02 -0700, (martin)
wrote:

Hi,I guess this will be a basic question for a lot of you but as I
haven't wired one in before I thought I would ask your advice. On the
power connection to the unit (radio/cassette (reasonably new)) there
are two different supplies, one is 'switched' and one 'continuous'.
what is the difference between the two and do I have to use one or the
other or both?

Continuous (permanent) is usually the main power feed to the unit, and
gives the supply to the amplifier, and also keeps the station presets,
disc position, etc stored when the unit's switched off.

Switched (accessory) tells the unit when the vehicle ignition's
switched on, allowing the unit to switch on and off with the ignition.
This is usually a relatively low current feed.

In virtually all cases, you need to connect both to get the unit to
work.

Jon
--
In-Car Express http://www.incarexpress.co.uk
Car Audio | Security | Multimedia | Navigation
Tel. 01223 301212 Fax. 0870 7484 123

"In-Car Express" wrote in message
...
On 14 Aug 2003 05:00:02 -0700, (martin)
wrote:

Hi,I guess this will be a basic question for a lot of you but as I
haven't wired one in before I thought I would ask your advice. On the
power connection to the unit (radio/cassette (reasonably new)) there
are two different supplies, one is 'switched' and one 'continuous'.
what is the difference between the two and do I have to use one or the
other or both?

Continuous (permanent) is usually the main power feed to the unit, and
gives the supply to the amplifier, and also keeps the station presets,
disc position, etc stored when the unit's switched off.

Switched (accessory) tells the unit when the vehicle ignition's
switched on, allowing the unit to switch on and off with the ignition.
This is usually a relatively low current feed.

In virtually all cases, you need to connect both to get the unit to
work.

Jon

Yup normally Red = Perm Live feed and yellow = Switch live.

If you get them the wrong way round you will know, because the stereo will
not hold its memory presets, or the unit will stay on when the ignition is
switched off

Ron

In-Car Express wrote:

Switched (accessory) tells the unit when the vehicle ignition's
switched on, allowing the unit to switch on and off with the ignition.
This is usually a relatively low current feed.

Seems to be the other way around in my Fiesta (1995). The switched 12V
can supply a lot more current than the permanent 12V, which has the sole
purpose of supplying a memory backup voltage.

At a guess I'd say this is because all Fords of that era (with the
standard DIN aperture) disabled the radio completely when the ignition
is off. Newer types allow you to turn it on without the ignition, with a
timeout.

I've replaced the factory-fit unit in mine with a Sony MDX-CA580 and
offboard amps. When connected to the permanent 12V feed the drain caused
the car's illumination to dim when the volume was turned up! This
doesn't happen when it's connected to the switched 12V supply.

(I know ideally I should have the amp connected directly to the battery,
I just haven't got around to doing this yet. One day, perhaps.)

--
Glenn Richards Tel: (01453) 845735
Squirrel Solutions http://www.squirrel-net.co.uk/

"Growing old is compulsory. Growing UP is optional." -- Anon