Stereo & Electronics - Line Lock???

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I just recieved my Line Lock from SJM and the kit looks great!!! I do have one question though. There are 2 black 18AWG wires comming out of the solenoid, are they both ground wires or is one positive and one negative. Also if they are a positive and a negative which one is which b/c they aren't marked. I tried calling SJM but it went straight to their voicemail.

You have to ground one and the other one will have to be run into the car for power (most likely from the cigarette lighter). I dont believe it matters which one you use for power or ground. There should be a wiring diagram with the instructions thats pretty self explanatory.