how exactly does the relay work? what exactly do I search for to buy?
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A relay is basically an electronic switch. It has two terminals for the coil, or the switch itself. A relay can have a multitude of other contacts that are switched by the coil. In my case, I used a 4 pole relay, which means the switch can switch 4 different things at once. I used 2 for my rear speakers, one for the right and one for the left, and a third for the trunk lights. so look for a 12 volt 4 pole double throw relay. or 12v 4PDT for short
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