Mystery plug. Please help - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 08-21-2007, 12:16 PM   #11
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Please put your year and model in your signature by editing your profile. Link at the top of the page.
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Old 08-21-2007, 12:46 PM   #12
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Maybe a picture or two would help.

You mention 4th plug..now black plug. Unfortunately most of us probably haven't dealt with your year enough to know the plugs overly well.
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Old 08-21-2007, 01:03 PM   #13
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the factory deck recieves 3 plugs in a stack formation, black, white, blue, these fit into my harness adapter for new deck, and the black plug contains +/gnd/rem/ant. the 4th plug is seperate on the other side of the deck, power for factory i believe, and i think i need to splice it into the harness somehow. ideas?

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Old 08-21-2007, 02:53 PM   #14
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It does appear that you would be missing some important items if that plug isn't added/spliced in. Is there another space on your conversion connector or harness for the items that are left out?
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Old 08-21-2007, 05:32 PM   #15
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That 4th plug with 2 wires is for the power antenna if you have that option..

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Old 08-22-2007, 01:06 AM   #16
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so i talked to the guy at mintek or whatever, and he says to just hook-up yellow from the 2 pronger , to the yellow on the amp and to just tape off the orange 1, but when i hooked it up, the dash came alive in fully lit when i plugged in the 2-prong, .....jeebus i gotta get some pics tomorrow! anyways thanks to all who posted, (i knew i shoulda stayed with the wrenches! juniors very first install!!)
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Old 08-22-2007, 08:30 AM   #17
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You'll get through it.

Yellow on our dashes is frequently used for Illumination. I have no idea where your source or buddy or whoever he is..thought it would make your radio work....lol
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Old 08-24-2007, 01:19 AM   #18
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The harness with the white-ish/transparent male connector is for constant battery power (orange) and illumination (yellow)
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Old 08-24-2007, 01:32 PM   #19
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thats great, but my real question is A) Should i splice the constant in to the batt (red) line, while leaviing red still connect to the 12 pin harness, or disconnect the red at the harness, this is the part i dont get, because the 12 pin has a red (supposedly a hot wire) but i got no power on the HU the first time i hooked it up, obviously because the 2 prong is constant power, and B) Since i am using a newer deck, do i need the illumination wire at all? Or is it for dash illumination? So the dude at metra was all wet when he said i should tape off the orange, eh? (yes i am canadian) now i dont feel so dumb hahahahaha...... thanks for the help guys!
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Old 08-29-2007, 02:16 AM   #20
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I'm going to assume you're going to purchase a radio wiring harness, because if you are not you are just making life much harder on yourself. Please avoid cutting the OEM plugs off as there is no reason to do so. You mentioned Metra so I'll describe their 70-1677-1 plug, which is what you would use on your car. All wiring colors mentioned here will be for the Metra harness and the harness that came with your radio. Well, actually all the coloring is described on the back of the Metra harness bag and your radio manual so I won't bother mentioning themGM colors will not match the harnessing so unless you want to become an installer don't bother trying to memorize what they are. You only need 3 wires to make the radio turn on, Constant (hot), ACC (switched) and ground. There are a total of 8 speaker leads, obviously two for each speaker channel. Illumination is not required, that will just dim the radio'* display when you turn your parking/headlights on... thats if your radio has that wire. If the car has a power antenna or factory audio amplifier that is still being used, then you'll have to connect that to the proper output on the radio, which will very from radio to radio but usually labeled as a remote and/or ant output.
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