“The blue wire. Do I connect it to switched 12volts? Or directly to the battery? Or a speaker wire? I have a 2007 gmc acadia with a factory radio. I really don't want to install an aftermarket radio just to install more bass.”
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The blue wire needs to go to a power source that turns on when you turn the ignition on. You can take it to a fuse box and get a fuse tap to replace one of the fuses that turns on when the key is turned on.
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