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I just hooked up my Tekonsha P3. After I was done connecting wires, I looked at the unit and it was on without a key in the ignition. Now I just want to make sure that it's supposed to do this. Otherwise, is the truck wired incorrectly in that the 12 V power wire is always hot? Is the brake controller only supposed to turn with a key? Now the instructions do say it will turn off after 15 minutes of inactivity. I assume this is how it naturally works. I have not had it hooked up to a trailer yet.
 

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It is right. All my Tekonsha controllers have done this and they all shut off. Nothing to worry about

Chris
 

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It gets activated anytime you hit the brake pedal, whether your hooked to the trailer or not. And then shuts down after 15 minutes of inactivity.
 
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