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Make your stereo turn on and off with the ignition
Published by Slippy
22-11-2005
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Make your stereo turn on and off with the ignition

A little tip for sei owners mainly but could easily be adapted for many fiats.

I've seen it written on here that to get a stereo working in a sei (as well as other fiats) that what everyone does is to join the red and yellow wires together. This means that the ignition feed for the stereo is now a constant feed, this means that the stereo will remain on even if the ignition is off. Not Ideal.

What i did, which is the simples way to do it, is to remove one of the electric window switches, on the back of the switch you will see 4 wires. One is larger that all the others. If you splice a cable onto this wire (which only provides power when the ignition is on...). When i say splice you could either cut and connecting block it together, use the blue clips which you can get from any autofactor or solder and heatshrink the cables together. when you have the cables 'spliced', connect this to the red wire and connect the yellow wire to the loom as normal.

This will mean that the stereo will come on and off with the ignition (as it should). If you car does not have electric windows, you should be able to take a feed from the back of the cigarette lighter also. Infact anything which doesn't work unless the ignition is on.

Doing it this way is a simple fix and will mean that you don't risk running your battery down by leaving the stereo on accidentaly.

The red wire doesn't draw much current at all. I think it's less that 5mA. It's just a signal to the stereo if the ignition is on or not so you won't have to uprate any fuses either.

I've done this to mine and have had no probelms whatsoever. It's easier that playing around taking a switched feed from the fuse box etc.

It's also neater that bodging 2 wires together that weren't intended to be joined together.

Thanks. Hope this helps.
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Old 18-04-2008   #1
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Re: Make your stereo turn on and off with the ignition

would this work for a handsfree kit too?
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Old 04-05-2008   #2
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Re: Make your stereo turn on and off with the ignition

my punto 2001 reg window switches work even with the key removed so be careful
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Old 30-08-2008   #3
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Re: Make your stereo turn on and off with the ignition

the window switches work for like 30 seconds after the ignition is off so you can put the windows up withoput needing the key if you left one open, not on permenantly.... im pretty sure.....
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Old 30-08-2008   #4
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Re: Make your stereo turn on and off with the ignition

Quote Originally Posted by manley91 View Post
the window switches work for like 30 seconds after the ignition is off so you can put the windows up withoput needing the key if you left one open, not on permenantly.... im pretty sure.....
Correct, they also stop working the moment you open a door so it will be fine
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Old 03-10-2008   #5
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Re: Make your stereo turn on and off with the ignition

What coloured wires do you attach to the window switch from the headunit?
Cheers
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Old 10-11-2008   #6
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Re: Make your stereo turn on and off with the ignition

Does anybody know how to do this with a mk1 55 punto, unfortunately the 12v socket stays on when the ignition is switched off, so no chance of plugging it into that, no electric windows or accessories like that?
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Old 17-11-2008   #7
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Re: Make your stereo turn on and off with the ignition

Quote Originally Posted by naaathaaan View Post
Does anybody know how to do this with a mk1 55 punto, unfortunately the 12v socket stays on when the ignition is switched off, so no chance of plugging it into that, no electric windows or accessories like that?
Splice off the power to the Ignition barrel.
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Old 17-11-2008   #8
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Re: Make your stereo turn on and off with the ignition

Interesting... thats on my to do list!!
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Old 17-11-2008   #9
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Re: Make your stereo turn on and off with the ignition

just take +15 supply from ignition switch (orange wire) always good to add a inline fuse.
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Old 16-07-2009   #10
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Re: Make your stereo turn on and off with the ignition

Quote Originally Posted by T14086 View Post
just take +15 supply from ignition switch (orange wire) always good to add a inline fuse.
What fuse size is best? 10A? 3A?
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Old 31-01-2011   #11
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Re: Make your stereo turn on and off with the ignition

nice one for this
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Old 31-01-2011   #12
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Re: Make your stereo turn on and off with the ignition

cheers was wondering how to do this.
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Old 07-03-2011   #13
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Re: Make your stereo turn on and off with the ignition

Any good tutorial with images ? I dont really get what's supposed to do ? Do I have to cut anything ?



What changes do I have to do ?

Thanks in advance
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Last edited by jmsoares91; 07-03-2011 at 23:56.
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Old 28-08-2011   #14
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Re: Make your stereo turn on and off with the ignition

Quote Originally Posted by T14086 View Post
just take +15 supply from ignition switch (orange wire) always good to add a inline fuse.
what fuse must i add?
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