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#328299 - 03/25/03 12:41 PM Red Wire Vs. Yellow Wire...
slowloudcelica
Junior Member


Registered: 10/28/02
Posts: 8

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I was just wondering which wire does what when installing a head unit. I know BOTH red and yellow wires for a car stereo wiring harness are +12V. But what is the difference? I looked in my manual and it said yellow was constant and red was "accessory/switched". What does that mean? Does that mean the yellow wire is switched on ONLY when the keys are in the car and turned?? Or is that something else?

Heres why I'm wondering.. I have always been simply running normal head units in my car (just match colors and twist wires) But recently I bought one of those DVD/TV tuner/MP3 player things that goes under the seat. This doesnt have the whole wiring harness connection that a normal CD player would, so I have to figure out how to hook it up.. and i dont know if I should use the red wire or the yellow wire for power. I'm also facing the same problem with my TV screen.

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#328300 - 03/25/03 03:35 PM Re: Red Wire Vs. Yellow Wire...
Supa Dexta
Member


Registered: 11/14/02
Posts: 408
Loc: canadia

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Well if your just wiring it in yourself without the proper harness, you'll have to hook the yellow to a wire with 12volts on it all the time, when the (key isn't turned on, or in for that matter) an the red will hook to a wire that only has 12 volts on it, while your key is in the acc position (not running but stereo, and usally the heater, power locks and what not will work) You'll need a volt meter or test light to find which wires are what, or atleast a colour code to go by for speacific vehicle, which can usually be found online or by someone on here...
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I'm not addicted to cocaine, I just like the smell of it...

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#328301 - 03/25/03 03:36 PM Re: Red Wire Vs. Yellow Wire...
patience
Member


Registered: 12/26/02
Posts: 477
Loc: Long Island

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Normally the yellow wire is your constant (never goes off) 12v source (usually a straight run from the battery with a fuse somewhere in between).

The red wire is normally your "Key On" which means then the key is in the off position (or just plain out) the red wire doesn't recieve any power. When the key is on (or in the start position) the red wire gets a 12v signal.

Yellow wire= memory
Red wire = turn on

Now all that stuff I just said desn't really mean anything. Why? Because some companies take it upon themselves to create their own wireing scheme and use any color code they see fit.

Rule #1
"When in doubt, check the manual."

DO that and you will screw up less often. ;\)

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