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Noob Question. How to know what wires are + - in car doors


YukonDCXL

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Sorry if this has been asked or answered, I just joined today and I am still trying to learn the site. I am putting aftermarket door speaker in my 07 Yukon but I am not sure which wires are + or - coming out of the doors and the speaker I took out are so blown that I can not get them to jump with a battery to see that way. any advise?

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Edit: 07 Yukon

1 second

Radio 12v red/white + radio harness
Radio Ground black - radio harness
Radio Ignition (GMLAN Serial Data)
Radio Illumination yellow (dimmer) + radio harness
Factory Amp Turn-on same as power antenna wire
Power Antenna white + radio harness
LF Speaker +/- tan - gray +,- radio harness or amplifier
RF Speaker +/- lt. green - dk. green +,- radio harness or amplifier
LR Speaker +/- brown - yellow +,- radio harness or amplifier
RR Speaker +/- dk. blue - lt. blue +,- radio harness or amplifier

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Sorry I was looking at that wrong. RF lt. green is - and dk. green +. So I have it hooked up wrong but they seem to sound fine? and when I was hooking it up I switched them back and forth trying to tell that way and i could not here a difference.

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