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Thread: Need wiring help for 2005 Grand Prix.

  1. #1
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    Need wiring help for 2005 Grand Prix.

    Hey all,

    I'm hooking up an amp in my 05 Grand Prix with the factory stereo (not Bose) and I'm using a line out converter hooking it to the rear speakers so I can run my RCA cables, but I'm not sure which wires are + and -. Also, where is the best place to hook the remote turn on lead for the amp? Do I have to pull the deck out, or is there a place under the hood that I can hook onto? I'd prefer not to pull the deck if at all possible since I have to run the power cable to the trunk anyway, I'd rather just run it with that.

    Thanks for any input!!!!

    Derek

  2. #2
    Car Audio Moderator durwood's Avatar
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    Crap...I think dark blue and brown are +...or maybe the wires aren't even that color...it's been too long.

    There was a rule I used to remember and I thought it was the darker wire was positive. But don't quote me on that one. Use a small battery and touch it to the speakers. If the speaker pushes forward then you have the right polarity. If it pushes backwards you have reverse polarity.

    One easy place for remote is the back of any cigarette lighter.

  3. #3
    MySQL Error scott_fx's Avatar
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    Quote Originally Posted by durwood View Post

    One easy place for remote is the back of any cigarette lighter.
    not always true. the c5 corvette's cig lighter are all constant 12v
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  4. #4
    Variable Bitrate
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    My cig lighters are also constant 12v, I've actually never heard of a car where they're switched...

    Anyway the best place to hook the remote wire to would obviously be the remote wire, yes it's on the back of your deck. You could use the ignition wire too, but that would probably also involve removing the deck, or at least more work.

  5. #5
    Car Audio Moderator durwood's Avatar
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    yes I should have mentioned to check to make sure it's swtiched. Whoops!

    I have never owned a car where the cig was always on. From what I have seen some have a swtiched AND a constant power. I wish I had a constant power one sometimes.

  6. #6
    MySQL Error scott_fx's Avatar
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    Quote Originally Posted by spoonraker View Post
    Anyway the best place to hook the remote wire to would obviously be the remote wire, yes it's on the back of your deck.
    again... this isn't always the case. when you remove the factory head unit in the c5 corvette it disables the acc wire in hte harness. I had to tap off a wire in one of the wire looms or i could have tapped off of fuse #22.
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  7. #7
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    ok, is the Grand Prix like the C5 where it disables the acc wire when the deck is removed? When I tried to find the acc wire with my test light, the only wire that would light up was the constant power wire, no other wire would light up with the key on.

    I even tried the harness for the little computer thingy (real technical I know, lol), and only the battery feed would light up. I know there's an acc wire in there somewhere, but I'm not sure which one it is, or how to find it.

    Oh, and I checked the cig lighter, and it has constant power.

  8. #8
    Car Audio Moderator durwood's Avatar
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    You could tap right off the accessory wire under the dash. It would require removing a lot of tape and loom. Should be a heavy guage brown wire. Again check this with a multimeter/test light to be sure.

  9. #9
    MySQL Error scott_fx's Avatar
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    do you have an acc wire on your hvac? if not get the multi meter out and start checking your fuses.
    New System in progress:
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    Transflective Xenarc

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  10. #10
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    you probably have a retained accessory power circiut that get's killed when the radio is removed.... from what I remember of it, there is a module that you need to add when removing the factory radio, it's mainly to retain the onstar, but it also resores the rap system.... it works through a data buss & the bcm....

    just jumping stuff out is not always the best way to approach this really...

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