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<blockquote data-quote="KaeZoo" data-source="post: 2739445" data-attributes="member: 554753">Break out the multimeter and quit guessing.Find your ground by testing for continuity with the outside shield on the cigarette lighter.&nbsp; Find constant power by testing for a wire that shows voltage with the key in any position.&nbsp; The illumination wire reads voltage with the parking lights on; the dimmer wire does the same, but varies with the dimmer switch position.&nbsp; The accessory wire shows voltage with the key in the accessory position, no voltage when it&#039;s off.Set the meter for OHMS and look for pairs of wires that read around 4 (or, since it&#039;s a GM, maybe 10) ohms of resistance with each other.&nbsp; Once you find a pair of speaker wires, touch them to opposite ends of a AA battery and listen for the pop to figure out which speaker it is.That will get you all the wires you need for the new radio.&nbsp; You&#039;ll probably have to replace some blown fuses before you find all the power/illumination wires, or if you want the dash lights to work again.</blockquote>

[QUOTE="KaeZoo, post: 2739445, member: 554753"] Break out the multimeter and quit guessing. Find your ground by testing for continuity with the outside shield on the cigarette lighter. Find constant power by testing for a wire that shows voltage with the key in any position. The illumination wire reads voltage with the parking lights on; the dimmer wire does the same, but varies with the dimmer switch position. The accessory wire shows voltage with the key in the accessory position, no voltage when it's off. Set the meter for OHMS and look for pairs of wires that read around 4 (or, since it's a GM, maybe 10) ohms of resistance with each other. Once you find a pair of speaker wires, touch them to opposite ends of a AA battery and listen for the pop to figure out which speaker it is. That will get you all the wires you need for the new radio. You'll probably have to replace some blown fuses before you find all the power/illumination wires, or if you want the dash lights to work again. [/QUOTE]

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