Ferrari Mailing List: Re: More Stereo Installation & Wiring Expertise Needed

[Charles Perry (charles]

This would, of course, work, but I think Robert's question was more how
to find and attach to a switched power source.

My recommendation would be to get a voltmeter/multimeter if you don't
have one already. Set it to DC Volts. If it's not an auto-ranging type
meter, pick a DCV setting that is appropriate for 12-volts. You can
touch the black lead to any ground (unpainted body, cigarette lighter
sleeve, existing radio ground, etc). Then use the red lead to check your
existing fuses and find one that reads 12V with the ignition on but
drops to zero with the ignition off. Once you've found an appropriate
fuse, you can use an item called a fuse-tap to draw power off of that.
It's basically a little piece of bent metal that slides under the fuse
and gives you a flat spade connector to which you can attach terminal 86
in Jim's scenario. In most cases, you would crimp on an insulated female
spade connector onto the wire to which you want to attach to the fuse
tap.

There are different kinds of fuse taps for different kinds of fuses
(round glass, flat blade, etc), so make sure you buy the right one for
your type of fuse. They used to have them at Radio Shack but you might
need a better car stereo or electronics store now, or even a good car
parts store. I like fuse taps because they are completely non-invasive -
they don't require you to cut, splice, or break the insulation of
anything in the car.

You can also use ScotchLok connectors (available at any car parts
store), but these are insulation-displacement connectors and so they do
do some very minor but permanent damage to the wire you attach them to.
But they are quite reliable if you make sure you get the right one for
the gauge of wire your connecting into.

-- charles


-----Original Message-----
From: Jim Conforti [mailto:lndshrk [at] xmission.com] 
Sent: Saturday, April 11, 2009 2:34 PM
To: Charles Perry
Cc: The FerrariList
Subject: Re: [Ferrari] More Stereo Installation & Wiring Expertise
Needed

Robert,

This one is easy.

Get a standard automotive relay - either a 4 pin or 5 pin Bosch Relay
and a matching socket and terminals.

The relay terminals are numbered.

Terminal 85 should go to vehicle ground

Terminal 86 should go to a any ignition-switched (fused) power.

If when you turn the car on - the relay goes "click" you have that part
right.

Terminal 30 goes to a (fused) source of constant power - like the
current existing radio power.

Terminal 87 goes to the radio power input.

When you apply power across terminals 85 and 86, terminal 30 is
connected to 87 and your radio turns on.

A five pin relay will also have terminal 87a - which does the opposite -
it is connected when power to 85/86 is off - and disconnected when it is
powered up.

Hope this helps,

Jim

_________________________________________________________________
To unsubscribe or modify your subscription options, please visit:
http://lists.ferrarilist.com/mailman/options/ferrari/charles%40carolina-
sound.com

Sponsored by BooyahMedia.com
and F1 Headlines
http://www.F1Headlines.com/