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Car Stereo Signal Wire

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No Tie into the thicker blue wire...That is the accessory wire that comes on and off with the key. Should be fine as long as you are not drawing any major current through that line. If all you use it for is a signal to the amps, you're fine.

If you use the red wire the amps will stay on all the time.

You can also use a circuit safe test light or meter to check the wires. Its a lighter blue thick wire. possibly 12-14 gauge that leads to the radio.
 
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