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

[Jeff Greenfield (coyote]

Rob - 

Read this, it should help answer your questions about relays.

http://www.parts-express.com/resources/automotive-relays.cfm

But, in this case, you really don't need a relay. I would just take your
switched +12v off one of the terminals on the fuse block. You might be able
find a spare unused terminal to connect to on the fuse block.

A relay only needs to be used if you are using a switch or device to turn on
a high-load device (such as driving lights, cooling fan, fuel pump, etc).
Generally a HU does not fall into this category. Another example would be if
you are using the blue remote lead to turn on several power amps and other
devices, then you would place a relay on that line.

Does this help any?

Jeff 



-----Original Message-----
From: Robert W. Garven Jr. [mailto:rgarven [at] gmail.com] 
Sent: Sunday, April 12, 2009 1:07 AM
To: Jeff Greenfield
Cc: The FerrariList
Subject: Re: [Ferrari] More Stereo Installation & Wiring Expertise Needed

Which would be the safest way?  I like the idea of the relay does it  
use the power from the radio wire or the power from the ignition on  
wire?  I am asking this as I dont want to blow anything up.


Robert W. Garven Jr.
rgarven [at] gmail.com


  "The Ferrari is a dream - people dream of owning this special  
vehicle and for most people it will remain a dream apart from for  
those lucky few". Enzo Ferrari






On Apr 11, 2009, at 11:49 AM, Charles Perry wrote:

> 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
>
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